Micro is extensible, but obviously doesnt have the ecosystem that vim, emacs or even sublime text has. I was looking for effectively the same thing as you and

Micro is extensible, but obviously doesnt have the ecosystem that vim, emacs or even sublime text has. I was looking for effectively the same thing as you and still settled on micro though. Let me know if you find something better. Tilde doesn't seem to work across all OS'es so it's a nonstarter.