Hi Don,
Construction on my eindecker has not yet proceeded to the stage of servo installation so I can't (yet) post any pics of my servo setup.
I did however have a look around for possible uses of bellcranks, pulleys ect.
The main problem also with my eindecker is weight, specifically how to cram as much of it as possible into the fuselage nose section.
This makes it very difficult to install, say the elevator servo in such a way, that the pull-pull cables exit the fuse at the required (and scale) location. Hence I've considered the use of either pulleys which would deflect the wires accordingly and allow some margin in terms of servo location or alternatively bellcrank systems (which amounts more or less to the same)
I reckon it should be perfectly in order to use a modified servo arm as a bellcrank, I'll probably end up doing just that.
Well, here are some of the pics I've scavenged

, hope they give you some ideas