i have tested a backup system using WSA (Windows Subsystem for Android) which is less resource intensive than bluestacks. you can use Pac-man with WSA tools to create standalone android apps. you can also build app-cloner for android on the pc and then clone zello to have multiple instances on 1 machine.
although it works, it does seem to crash after around a day or 2.
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as a side note, we could, if it came down to it, mirror a smartphone or even use a smartphones audio routed into a pc and vice-versa, maybe use an external mixer etc.
im trying to figure out a few options as i have multiple instances of zello for pc running 24/7