@wigwagmod's reply indicates limited knowledge concerning what folks can do on their own.
The EU and most English-speaking countries permit (and even encourage) "hobbyist" use of low-power radio. This is typically under 100mW, but can be far higher in some locales and in some bands (YMMV - check local regulations).
This applies most generally to "unlicensed spectrum", which in the US includes things like the 2.4 GHz and 5 GHz bands used by WiFi, as well as other ISM bands. If you have a ham radio license, many more bands are opened up for low-power operation. Again, each country has different ham radio rules, so YMMV.
In the most literal sense this means you can design, build and operate your own radio, so long as you stay below the emission threshold where regulatory control kicks in for the specific band used by the radio.
The need for device certification arises in the context of production: When making "black boxes" for consumers, the manufacturer must ensure your device is a "good RF citizen". This protects the consumer from the sins of the manufacturer. Primarily, the certification rules exist to keep neighbors from interfering with each other.
In the specific case of using a device that isn't certified in your locale, the responsibility for correct operation falls to the user (not the manufacturer). In particular, this means you must be personally willing to assume all responsibility for operating the RF device within all applicable legal limits.
Most people are ill-equipped to take on this responsibility, hence the preponderance of "don't fix or hack this" laws. You'll see stickers saying things like: "No User-Serviceable Parts Inside: Opening this device will void its FCC certification."
However, done carefully and correctly, this is exactly what we want to do!
I say this as a long-time holder of a US ham radio license. I have built a few radios and modified many more. I've owned radios that violate US certification regulations, which I modified to operate within legal limits.
I've also helped get a few industrial devices FCC and EU (CE) certified, primarily in the area of avoiding stray emissions rather than actual radios, so I know a bit about staying within emission limits across many bands.
There are no bands that have "zero" emission limits: The laws of physics simply disallow it. Every band has a non-zero emission limit, a limit that varies based on equipment certification and/or operator certification.
In regulatory terminology there's the concept of "intentional" vs. "unintentional" emission. Intentional emission means you have a radio, and must meet very stringent emission requirements within the desired band. Everything else is "noise", which has a much lower emission threshold. However, it is generally perfectly legal to do intentional emission below the noise threshold (commonly done by UWB radios).
In the US, most of the relevant regulations are in Parts 15 & 97 of Title 47 of the Code of Federal Regulations (CFR47, Parts 15 & 97). While the regulations are fairly well written, careful interpretation is sometimes needed. In the US, the ARRL (Amateur Radio Relay League) has done much of the heavy lifting needed to document the regulatory nuances.
Most other countries have similar regulations and ham associations: Google should easily help you find them for your locale.
OK, enough of the regulatory stuff. What does this mean when I want to use a Wink 2 Hub outside the US and Canada?
First, several bands are standardized across many nations (a few are "worldwide"), so in these bands there should be few, if any, issues.
Many radios used in HA devices support multiple bands. Sometimes the band is selected in hardware, generally by connecting configuration pins to VCC or ground. If the Wink 2 Hub uses such radios, and they support bands that are legal in your locale, then it should be "OK-ish" (see below) to hack the pins to the desired configuration.
Other multi-band HA radios are configured via software, by setting bits in registers. More and more radios are using software configuration. In this case, it's necessary to hack the software/firmware, which may be as simple as changing the value of one or two bytes, but more often requires a much more complex software change.
No matter how you reconfigure the radio, you will likely have the situation where the existing antenna is a poor match for the new frequency band. This is a Good Thing! A mis-matched antenna will greatly reduce the radiated power, helping keep the RF output closer to a legal level. Unfortunately, this may also make it too weak to be useful. And it increases the reflected power, which in rare cases can damage the radio.
Most antennas in HA products are implemented as traces on a PCB. While it is possible to hack these traces to permit use of an external antenna, such modifications can be difficult and thus are very likely to fail. However, ceramic antennas are also common (the size of a grain of rice), and these can sometimes be replaced quite easily.
Another possible case is that the manufacturer makes multiple radio modules, one per band, that are otherwise identical. Z-Wave uses this approach, so it may be possible to simply remove the existing Z-Wave module and drop in the right one for your locale.
Please don't start down this road without a ham license: It really helps, in multiple ways. If you aren't familiar with modifying RF devices, please wait for the Instructable.
Once you are done and your mods work, find someone with an RF spectrum analyzer and ask them scan your modified device. No matter how careful you are with your modifications, nothing beats actually checking the result of your work.
So, how much effort are you willing to commit to correctly operate a Wink 2 Hub outside the US or Canada?