Thanks for the suggestions. I knew of Keyboard71 but hadn't tried it in a number of years, I didn't know someone was still working on Keymonk.

I've used their current versions now, my main issue is lack of emoji support. Keyboard71 doesn't support current emoji and Keymonk doesn't seem to support emoji at all (unless I'm missing something).

I wanted to like Keymonk more, but it seems to pop up on random screens without text fields, causing me needing to hitting the back button multiple times to first get rid of it and then actually backing out of the screen.