Yes!, at the cost of recording, speaker stats, and all participants having a pre-shared secret. Or you could use a peer to peer service that doesn't use a media router, if you have few enough participants.
Insertable streams are coming, along with e2ee through media routers. The Jitsi folks are doing great experiments there, and I'm happy they have taken the lead.
I think if I were in your shoes right now I might use a peer to peer video conferencing application that relies on tried and true p2p e2ee (or build one, it's not hard).
Insertable streams are new, and less proven.
An honest question, do you visit sites served by Cloudflare? Is point-to-point encryption okay for your use cases there, or do you have security concerns that require e2ee for your communications?
Insertable streams are coming, along with e2ee through media routers. The Jitsi folks are doing great experiments there, and I'm happy they have taken the lead.