Auto select pavucontrol profile on HDMI plug

[OJFord]

On the Framework at least, HDMI audio appears as a (many) profile(s) rather than a separate controller, so it's annoying to swap when HDMI is plugged in and that audio required (and not automatic).

Put up with this for far too long, should find a way to do it automatically.

Worst case should be perfectly possible by udev and pavucontrol command, but maybe kanshi can do this? That would be ideal since it's always going to happen at the same time as a display change, and then can automate to switching controller to the USB one on kanshi desk profile too.