EU account - US game + DLC

Hello everyone!

I'm originally from Europe and my PSN account is European. I moved to the US not long ago and bought a PS4 together with Ni No Kuni II: Revenant Kingdom.

Now to the problem: I want to download the two DLCs for the game. Is there any way for me to download the American DLC versions without losing my game progress?

I created an American PSN account but realized that I can't log in to my profile using that account. I contacted Playstation support about changing my region, but it's not possible. I also read that it's impossible to transfer save files to other users.

Thank you in advance! :)

Buy the DLC on the NA account, and play the game on the EU account, its annoying but it works.