Probably, you might get the new "you're shopping from the UK" prompt next time you buy but you can just skip it and tell them you're in the US with no issues.
I did that last night and changed the country back no problem on amazon.co.uk afterwards.
Yeah that seems easy enough (and it accepts it) but it's a little concerning, I don't wanna mess up my Kindle library and stuff by switching around all the time!
Setting up a new account looks like it's worked though, maybe. The item is "pending verification" which I guess is because it's a digital code on a new account. Who knows what'll happen now. If they check my card address I'm done for because it does not match the Borderlinx address I gave them! But I've ordered using that card/address combo loads of times.
All I want is that stupid Omega Quintet RPG and this is the pain I have to go through.