Yeah, took that into account, and decided to go for it anyway. Got a lower spec (4060 card) ASUS Zephyrus G14 (2024) from Best Buy ordered to a friend's address for just over £1100 after the sales tax. I don't think the equivalent model is available here, only the one with the 4070 card in, but that one costs like £2300 with identical specs otherwise.
I think for on the move, that should be more than good enough. IIRC US and UK keyboards are slightly different, but I can live with that, and would be using a larger keyboard when home anyway. And yeah, I believe the power cords should be cheap enough, but also adapters aren't too bad to travel with.
Basically, for the vast amount saved, I think it's worth it for me, but that's predicated on the fact I was already going to the states and the specific laptop I was eyeing up.