For ME3 this should not be a problem.
If the game only has English audio you should be able too set polish subtitles.
The question is if it works for the first two games.
May I ask from were you have the information that the polish version is language locked?
Year 2021 and region locks are still alive.
That is unfortunate, but you should be able to get a international version at for example Amazon Germany or Amazon Uk.
And what about? It will be still region locked. I want english voices and polish subtitles. End of story.
No, it shouldn’t. The key is the deciding factor not the Region you are in. (You get a polish key if you buy in Poland.)
That was at least true in the past.
You are already in contact with EA support, you can ask there to be sure.
