We have brought back fixed and h/h vhf (non dsc) radios in the past with no issues. They have all, even a cheapie, been switchable to int channels and there is very little difference twixt us/int channels anyway. From memory Ch 07 is simplex in us channels and duplex in int., no doubt others with time on their hands will tell you any others. We only once had a minor problem whilst doing a magazine test on a German rib lifeboat. Coming out of a certain marina we found that they used channel M which the german spec radio didnt have, neither did the us handheld that someone
had in their pocket. Lock operator got really shirty about it. So if you use a marina check what you need.
No problems finding a charger in the past.
To be honest its a while since I was in the US but last time didn't find the price difference was worth the inconvenience any more.