Thanks a lot, that's beyond useful.
- Cetus MK3 already has 3x homing switches, so sounds like I might even already have all I need.
- Adapters seems the right way to go so it's easily reversible, but eh, 'ain't gonna need it '.
- Duet 2 Wifi came with a little bag of JST connectors; if I'm lucky, the metal crimp terminals might be the same. If so I'll just need to change the plastic shells over (while carefully counting on my fingers which colour goes to which pin). If I'm extra lucky and Cetus doesn't change their wiring too often, maybe it'll even match your photos and help confirm I'm on the right track
Big thanks again for that, I'll try to post something once I get things going