Im testing and studying the whole EUR titles on USA consoles and was wondering if it was possible if i can get official updates for the title while on a USA 3ds and USA NNID?
Not at this current point in time, no. If cearp ever releases a guide on region changing emuNANDs, then maybe, but who knows (it's just speculation, and last I heard, they had no luck getting the eShop to work).