audio – Turn off the Cell Radio?

Any way to simply turn off the cell phone radio?

This need has come up in ZOOM sessions using the zoom app because that app uses the “phone audio” rather than “media audio”

As a result, it is impossible to include meeting audio if you ChromeCast the session. The video works, but the audio only outputs using the phone’s speaker or audio jack. Testing using an android tablet rather than an android phone shows that since the tablet does not have a cellular radio, the meeting audio is cast with the video.

Airplane mode is not an option since that would prevent connecting to the internet.

In addition, trying to address the audio using a bluetooth speaker doesn’t work either… while it’s possible to initially send bluetooth audio to the speaker, something unknown turns that off after a few minutes.

Any thoughts on addressing this would be appreciated.
Beverly Howard