I had 3 different countries stores on my iPhone, now only 2 but everything has been updating fine for years. But I have different accounts for each region so maybe that works fine?

It’s a bit late for this suggestion, but unless your moving for good, having 2 Apple IDs setup with different countries is the easiest way to handle moving abroad.

I assume that the only apps you might run into some issues with, are the ones that are not listed in your new country’s App Store.