[colordrops]

And even better would be to support the Google Cast protocol to increase adoption while offering a roadmap to transition to a better protocol.

[adinisom]

Unfortunately that's not possible for receivers barring a break in crypto. Receivers are authenticated by the sending devices:

https://blog.oakbits.com/google-cast-protocol-receiver-authe...

An alternative Chromecast receiver needs cooperation from the sender one way or another.