Account and different regions question

Gotta question I'm trying to figure out for a friend of mine. And not sure which forum category this belongs in.

She currently has a US region account, but due to her location an EU account would be easier for her to keep sub (cheaper and more widely available game time cards). So what I was curious about if it was possible to have 2 regional versions registered to the same account, since she really doesn't want to start over. I.E. both a US version and an EU version on the same account, like you can do a PC and PS4 version on the same account.

It's not possible without starting a new account and new character.