And since that doesn't exist, the topic is purely theoretical. I told you...
Even a joint regulation via KNX or radio is considered sufficient by BAFA. There are also Nibe ventilation systems that you connect to the uplink of the Nibe heat pumps and then control them with it. Therefore, very much existent. Just read up smartly at Zehnder, Maico, Nibe, etc. The manufacturers now actively advertise this, as the above approach has been officially confirmed by BAFA as eligible for funding.