2 years ago, and still now answer on it. I am also interested in this feature. It should be possible to force bluetooth on, to prevent students from not accessing a classroom class. And keep them the ability to pair their devices. Actually it is a educational measure, to individualy set the restriction on some devices, if they use this technic often. So they are foreced with bluetooth on, and the loss of new pairing with bluetooth devices.

Do a screen-recording and hand in your feedback via https://feedbackassistant.apple.com On your device should this assistant be available.