Unfortunately, stuck with Apple’s iOS.
Bluetooth 5 should allow dual audio but it seems apple disables it and you’re forced to use airplay (
https://support.apple.com/en-us/HT208744).
I have read that through the Bose app you can use dual audio but I never installed it due to the previous security issues with using their App. I guess I’ll try putting it on my “burner” ipad (travel pad with just media on it and no contacts/email/messages sync’d). I hope it will work with anybrand BT device as I don’t want to buy another pair of Bose BT headphones.