I came across this purely by accident, but it checks pretty much all of my boxes for a good keyboard:

✅ It is simple, beautiful, and customizable. (I like to use AMOLED black, and increase the height a bit)

✅ It has built in offline voice typing. I had been using sayboard for this which was not bad, but so far this is a little quicker and more accurate.

✅ It has easy to use settings (I used ASK for years despite the mess of the settings)

✅ It’s FOSS. Edit: Apparently, it’s currently under a development license that limits certain types of use. The source code is open, and the stated intent is to make it fully FOSS when it is completed.

✅ It has swipe typing. I was using heliboard with a gesture typing library added, but it’snice to have it built in.

It has some interesting features like using an adjustable LLM for text prediction. It will be really interesting to see how it shapes out.