This is the idea behind this jigNo, you would just need to make your guide in a way that it can be rotated 180 so as to be referencing off the same thing both sides.
It is going to be a winter project for me and the guy Carmonius Finsnickeri was the original version but now there is a Woodpecker version / copy called mortice match
but at £830 that is one very expensive jig.
https://woodworkersworkshop.co.uk/w...NfImNtyBGYAk1YLVDGn5c1xB4MI_6YBRWiemT9C22-zMW