Cyril, I'm glad to meet another retired professional engaged in the joy and challenges of digital music-making! I was formerly a weapon systems designer.
Logic's Environment has been my main place of work in my private passion of music-making ever since I first met it 21 years ago in Logic Audio Platinum 3.5.
Perhaps I didn't clearly explain my own current situation with Logic. I have no problems working in High Sierra with VEPro AU3 7.0.1056 and Logic 10.4.8, using my AU3 multiport template. I shall continue with this configuration for as long as possible, hoping that Apple will eventually fix the new problems in Logic 10.7. But I also have a Big Sur boot volume in which I keep an eye on the state of affairs with later Logic and VEPro versions (though of course I won't know about Apple M1 operation until I buy M1 hardware).
I'm sure other Logic users who don't have the convenience of working with an older Logic in an older macOS may want to know about your VEPro AU2 multiport workaround, Cyril. Perhaps you will post something about it here? (Toutefois, Je suis certainement d'accord pour dire que la perspective d'une arriviste déclenché, jetant sa merde tout atour en conséquence, est désagréable pour vous et moi. Lol.)