Any new shortcuts to copying rigging from one puppet to another?

I created a cast of animated robots in character animator. Each was very time consuming to rig, since they have things like heads on arms, or eyes dangling from chains.  I am now realizing that I want to do 3/4 and profile angles of the heads and bodies as well. Is there an easy way to copy the rigging from the front angle to the 3/4 and side angles? When I try to just do it manually, I seem to be always missing one thing and it takes me forever to get it to work right.