If experience is anything worrying about it is irrelevant. No one has a way to see your hardware other than being able to tell you are overpowered on transmission or w/e, other than if you had blatantly told them. Personally, I don't care if you hacked your UV-5R to work as a UV-5X/G as well, as long as you have the license. (They're hardware-wise identical, there is only a firmware difference, etc... You would still be 'operating' your radio at an acceptable limit on repeater frequencies, etc...) I'm not aware of the FCC chasing ANYONE down for radios provided that they aren't using bands they're not authorized to use and not doing something that interrupts other users. Not that I'm advocating it... These radios are so cheap you can own quite a few of them, and just buy them for all the bands. Baofeng got in trouble for the UV-5X, fined by FCC, and this is why it was rebadged, etc... We know at least the GMRS radio is compliant, lol.
Also, the FCC ID right off my UV-5X box:
https://fccid.io/2AJGM-P51UV
So, looks good to me.