Hello, I am building an IDEX 3D printer from scratch based on the Craftbot Flow IDEX. Just like the Craftbot, I would like to use a BLtouch for Z probing and a closing electrical circuit with the nozzle(s) and bed to determine the XY offset. The Craftbot uses a hole in the bed that is probed on both sides by the two nozzles to calibrate the XY offset (see https://www.youtube.com/watch?v=NDvp8JoAuuo on 2:25).

I have bought a Duet 2 wifi and Duex5 however, I have still only one probe (Z-probe) pin on the Duet 2 wifi that can detect a closing electrical circuit. I plan to use those pins for my BLtouch, but how do I wire the nozzle(s) and bed togther to detect a closing circuit? Can I use endstop pins?