Avoid changing playback devices when connecting bluetooth speaker

Using pipewire, every time I connect a bluetooth speaker / earphones, I need to use pavucontrol to manually change every Playback source to use the bluetooth device.

I seem to recall that with pulseaudio, I could set the playback default to be a "Monitor of " something or other, and then redirect that single monitor to output through the bluetooth speaker.

How do I make a single change (or even automate it) when plugging in my bluetooth speaker to have all playback go through the bluetooth speaker?