How to add third party participants with a single "sendrecv" PeerConnection

[ypedegroot]

I am currently using LiveKit SFU to implement various scenarios, including one where I need to connect a third party that only allows a single PeerConnection to be used, with a sendrecv offer (or answer). I have no control over the workings of this third party WebRTC client.

I understand that in the LiveKit SFU architecture, two PeerConnections are used: one for publishing and one for subscribing. How would I proceed with connecting a third party client as described above to a LiveKit Room? I use the client protocol (protobuf) to communicate with the LiveKit SFU server using websockets. Any help is greatly appreciated.