Yay for Unexpected! I was really surprised when I found out just how many keyboard shortcuts it supports. I find myself using the keyboard-based text selection/copy/cut/paste/cursor-movement/etc more often than the "normal" way. It's also a great help when using Termux or generally writing code.

It's available on the IzzyOnDroid repo

https://apt.izzysoft.de/fdroid/index/apk/helium314.keyboard

Eeeeeee!