vladimir on Nostr: I fear that's not possible. 44.1khz/16bit(cd quality) for stereo out and mono in ...

I fear that's not possible. 44.1khz/16bit(cd quality) for stereo out and mono in required over 2.1mbps bandwidth. Best bluetooth codecs nowadays can achieve an absolute maximum of 1.2mbps over very short distances.

You should check new Sennheiser wireless systems. https://www.sennheiser.com/en-de/catalog/products/wireless-systems/profile-wireless-2-channel-set/profile-wireless-2-channel-set-700266