With the Termux + PyPi repositories you can do basically the same as you would do in a normal Linux terminal and it’s great.
I’m not a fan of having many apps on my phone and with Termux I can have yt-dlp, ffmpeg and even magick to do almost anything I want, it’s just great and I don’t know how Termux is not more popular, I hope more people will find sense in it and use it too if they see a use for it.
What do you mean by special on screen keyboard? I usually just zoom out the screen (making a pinching gesture with the fingers) and that works for me.
It doesn’t use the regular android keyboard, it has its own that is harder to operate.