The Dillo+ (Dillo-Plus) project has already added Gopher and Gemini support to their port (they don't use the word fork) of Dillo:

https://github.com/crossbowerbt/dillo-plus

https://github.com/crossbowerbt/dillo-plus#gopher-and-gemini...

Edit: Newline formatting. Edit 2: Wording (port not fork).