I’ve looked at a few on fdroid and they all seem like they aren’t being maintained anymore.
Edit: I’ve spent the past day trying most all of the suggested keyboards here and I think I’ve landed on either Unexpected Keyboard or AnySoftKeyboard. Thanks for all the suggestions. Thumbkey is quite the thing to get used to.
Is this available on F-Droid?
They may also be referring to this but I’m not certain.
It came stock in crDroid 10.
For previous AOSP keyboards, someone has extracted the .apk and posts it on apkmirror