Termux has its own keyboard that includes ctrl and escape. It's not nearly as nice as a REAL keyboard, but I'm usually just reading or editing a few lines at a time.

Dragging the finger up and down emulates the mouse wheel, do I don't even have to do ctrl-v.

I also use it with an android tablet that DOES have a real keyboard. It works fine, though I haven't figured out how to persistently swap ctrl and caps yet.

Moreover, the special extra Termux modifier keys are configurable in ~/.termux/termux.properties. I added Shift to them, because although there's a Shift key on Gboard, Shift-Enter is not treated the right way by org-mode if the Shift is from Gboard.

For some reason if you use the Thumb-key keyboard, every letter is capitalized by default, so you have to swipe down on the A before typing anything, which is a deal-breaker.