A work in progress. KeybaseMutt exists to let its users utilize Keybase within NeoMutt. (Unfortunately, not natively (yet).)
Run the install script. It will set up the directory’s and paths for you. Do what it says or suffer the consequences!
Then just throw these into your .muttrc
set editor = 'echo %s > ~/.neomutt/keybaseMutt/.tmp; vim %s'
macro compose K "<enter-command>unset wait_key<enter><shell-escape>python ~/.neomutt/keybaseMutt/keybase.py<enter><enter-command>set wait_key<enter>
Check out the GitHub page for the full documentation.