Yes, it's the same technique thumb-key uses but will a full blown traditional qwerty layout.

Imho, Unexpected Keyboard is the best FOSS keyboard for (western/latin-rooted) multi-language environments. It's a pity they don't have spell check but when you speak multiple languages the spell check can often get in the way if I'm honest.. unless you can select multiple dictionaries at the same time (I haven't really seen any FOSS keyboard allow that yet).