Epubs are just re-nammed zipped files full of XHTML or HTML files, so I change the file extension to ".zip", decompress it, and change the file extension of the chapter I want to edit to ".txt". Then I can edit the files with any text editor. I usually use which chapter is .txt to indicate which chapter I'm editing in and change the file types back and forth as I go, but you could also change all of them at once at the beginning and put them all back at the end.
To make the edited epub, I delete the original .zip file and compress the folder.
It's a little bit more tedious to do it on a phone than with a mouse and keyboard, but since I almost never sit down and read on a computer anymore editing ends up getting done faster overall.
Remembering to transfer the file from the phone to the computer is a little annoying, but otherwise the workflow all happens on the device I read on, which is nice. I only need to copy the file over and import it into Calibre when I'm done.
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