Thanks @mathijslaser
for the interlock situation I can look at the rj45 interlock terminators of the different brand lasers and see they are wired differently.
I’m wondering if I could make a short rj45 socket and plug cable that swops over the offending pins? and put this in place before the Emma laser - and then another that swops them back and put this after - if there are more knight lasers in the chain afterwards.
I would need to get this made as I don’t know much about rj45 wiring.