Why would you have any problem with Master and Slave comms? I don't see your reasoning at all here. It's not any more complex than wiring for DIN or BNC from SpeakerLink. If you keep your pin wiring straight, keeping the 100ohm impedance intact, checking voltage levels to see if anything is out of the ordinary. By using standard parts Meridian save cost. We are not talking about powering 50w devices over SpeakerLink with technology like PoE here.

Building/buying adapters/cables/whatnot have always been use at your own peril unless they have an M logo stamped on them.

DSP8000SE, DSP7200SEHC, DSP5200SE sides, DSP7200SE rears, 861v8, 210, Sim2 Ultranero 4, Stewart Cinecurve 2.35:1, XEIT CM-5E Anamorphic lens, Dune HD Duo Cinema 8K and Wireworld Platinum 48G HDMI -> UHD722 -> Shunyata Omega Ethernet. Shunyata/Furutech power-cables/filters. SR Master Fuse@861v8. Uptone Etherregen with 10MHz OCXO clock.