Gerrit it would only need to be the studio that needed the NDI connection, so the Teams web app should suffice. But if holding the meeting in Teams is going to put people off, it may be better just to have it as a separate event that anyone can join rather than a panel session livestream. We could even record the event and edit down highlights for the Livestream.
It’s a little painful that both of the best video quality options for our studio are Microsoft. We put a huge amount of effort & money into making WebRTC work during lockdown, but couldn’t get a solution that came close to either Zoom or Teams.