That's a huge ask. The joystick + four buttons paradigm for controlling LSDj and similar Gameboy trackers would require a complete rewrite of the UI in Octamed.
Currently Octamed SS is based on the Amiga's Intuition UI libraries. Intuition does a lot of the heavy lifting for dialog boxes, menus and so on, and Intuition expects the user to have a full keyboard and mouse.
Octamed 5 or Protracker 2.3 would be likely easier to adapt for joystick input due to them having a fully custom non-intuition UI, but even those would require massive changes.
