Multiple Receiver support with non-Pixhawk boards?

Many protocols allow for redundancy independent of the autopilot. Both FrSky and Spektrum offer that flexibility. While I’m not a fan of either for my own use, I could understand leveraging their redundant receivers on a large craft or critical application.

I once got pretty creative and did this:

Now I use ExpressLRS, which offers superior range and better telemetry forwarding.