I was planning on taking on porting Emacs to the iPad, given that it's a fantastically fast, light and low-power modern portable computer. But reading this gave me pause, I'm not sure I can dedicate as much time to this as it seems will be necessary...
If you’re willing to give up local editing, Blink.sh/mosh + tmux + emacs/emacsclient on a remote host has done the job for me.
Would love to know if anyone has a good terminal solution for emacs, (ideally kickingvegas' blink.sh/mosh + tmux) ... I returned to XWindows via WSL (Ubuntu 18.04) + VcXsrv for emacs daily use.