Bluetooth input for video recording : Android 10, One Plus 7

I have seen this question https://android.stackexchange.com/q/32172/131553 posted 8 years back and app solutions do exist but not with Android 10,so it's not a duplicate of this question or other questions which suggest apps (they don't work for me) I am helping my wife record instructional videos on OnePlus 7, running stock Android 10 (*not rooted*). I want to use Bluetooth audio input instead of the device mic, as it would provide better flexibility. * I don't find any settings to enable Bluetooth in camera or elsewhere and internet search hasn't helped. * Blogs recommend apps but surprisingly none seem to work reliably with Android 10. [BTmono](https://play.google.com/store/apps/details?id=com.bedoig.BTmono) works *sometimes* and is not a reliable solution, and similar story with [Camera fv5](https://play.google.com/store/apps/details?id=com.flavionet.android.cinema.lite&hl=en) Any suggestions, including apps, accessories are welcome **except** * Separately recording audio and sync with video, that's too much work * Involving signal processing hardware * Root * Laptop * Accessories like mic (I have asked for accessory advice on [SE.Video Production](https://video.stackexchange.com/questions/30194/eliminate-background-noise-in-home-made-videos/30207?noredirect=1#comment41372_30207) and hope to get better answers there)