[ChriChri]

Would having a different sdcard each work?

Yes. That is what I'm doing atm. But it has disadvantages:

Putting the sdcard in the card holder is very difficult and I do only own one atm. Changing the card in the card holder I actually fear to break it. So with one of the cards the slot stays open which is not a good solution.

The settings seem to be stored in internal memory somewhere. Changing the input methods, bluetooth default connection, etc. They are shared.

My preferred solution would be one card for all profiles (I'd probably glue it somehow to stop me taking it out inadvertently) and a menu option to switch between profiles.