Yeah, I thought of doing that, but then I read someone on here pointing out that the maps are tied to your device code when you purchase them, so that wouldn't work.Yup this new feature has absolutely nothing to do with whether you can fit and use the NA map on your SD card or not.
If Home sees a device connected other than the unit the map you are trying to download is meant for, your SOL.
You could have a 1000000000TB card installed in your One. And you won't be able to download it.
I don't know if this would work or not but you could try borrowing someone's unit that the NA map is intended for, connect to home, try and download the map and see what happens. If you can download it, then reconnect your one and see if you can install. I doubt it would work but worth a shot.
Anyway, I called TomTom and the rep said TomTom made changes recently to prevent users from doing what we're trying to do. He said that I will be issued a full refund, however, so that's good. I think it's completely stupid that, if a customer is paying for a map, they're prevented from putting it on a certain device. But this is just another money grab to force people to buy the more expensive units so they can have the better maps.