@Fungineers,
Before you read on, there may be enough info on the web to figure this out about the Receiver, but I do not know since i have never seen or worked with those.
I don't know enough about RadioLink or that receiver, it looks like it should work by hooking the pin labeled SBUS (pin 11, ONLY 1 wire!!!) to RX6, but how to get it out of PWM mode and into SBUS mode and how else to work with it I do not know. Or even if it will work at all, as you said, it may be too outdated (PWM is for planes and such that have Servos instead of FC's). Unfortunately I don't know for sure, all you can do is research it and see what you can find out. It would really make it better if you sell the RadioLink and buy a Frsky QX7 or QX7S (QX7S is preferred if you can swing it).
Telemetry will not work as you have described from the looks of things, but I don't know for sure. If it was going to work, it seems there is a second module that may plug into the receiver at the 4 pins labelled GND/SDA/SCL/VCC, and you would take this second modules wire (1 wire only) to the RSSI pad on the FC (, but I do not know.
If it was Frsky we would know, but I don't know anybody using a RadioLink. Perhaps google for some Youtube videos to see if you can find anything. If you are not sure let me know and I will try to research a bit for you if I can.
You misunderstood me, or I was not clear about Inverted vs Un-inverted...
There are some manufacturers whose protocols are ALWAYS inverted, like SBUS.
There are some manufacturers whose protocols are ALWAYS UN-inverted, like DSMX, or Crossfire.
You MUST hook up Inverted protocols to Inverted ports, and you MUST hook up Un-inverted protocols to Un-inverted ports, or they will not work