I'm writing a #Gemini CGI script that lets me edit and upload any file on the server, as long as I give it my certificate. I'm using the #Titan token field for extra commands, such as "remove" or "delete" to do that action, and likely next I'll add "mv" and "cpfrom".
Using #GmCapsule (thanks @jk), it's plug-and-play. You can configure it a bit too with some vars at the top of the script.

https://gist.github.com/bleonard252/8c3981864f3be85f60b9ae2590ca0e6b