I need weird advice for soft keyboards

Hi everyone. I'm close to buying a Unihertz Jelly Star (this nugget here). One of the last things keeping me away from ordering is my concern with typing quality. ("Say what, on a three inch screen??")

Normal qwery-keyboards won't cut it, and thus I'm looking for recommendations on software keyboards for either tiny screens or super fat fingers. As I don't love auto correct, are there any T9-like keyboards for Android (9 keys is quite few, but how about like half of the keys of a full size keyboard)? Also, is there a way to install WearOS (or whatever Google calls it this week) keyboards on a normal Android phone?

If you've got either very fat fingers or a tiny screen, hit me with the keyboard apps you're using. Thanks a lot!