This is an excellent initiative, thank you for building it!
Signalling for me has always been handled on a cheap box in some specific AWS regions. The tricky thing was that there was always more latency than I'd like in the initial establishment of the connection. Reducing that latency always played second fiddle to other issues. CF workers is an elegant solution as all signalling would be handled at the edge.
I'm looking forward to taking this for a spin!