How to stop Windows from disconnecting from Bluetooth when plugging in physical 3.5mm headphones?

I use a Windows 11 PC with a Bluetooth headset to communicate with work colleagues throughout the day. But it's not all that comfortable for extended periods and the sound quality is just OK. So for listening to music while I work, I prefer a nice pair of Sennheiser studio headphones. They are extremely comfortable and sound great even with the 3.5mm connection. The trouble is, when I plug in the headphones to my PC's headphone jack, Windows completely shunts all audio output to the headphones - even cutting off Bluetooth audio I/O. This means that any time someone from work wants to talk, I h

Question by JVC on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.