Two devices on one telem port

Is it possible to have two devices sharing one mavlink stream?

I want to connect the ground end of the RFD to laptop with USB connector but also want to be able to split that mavlink stream off into an OSD. I get that the USB connection will be receiving and sending data but the OSD just listens. Could this be made to work?

Yes, connect only Rx pin of the OSD(plus power) and you’re done