Start small, then grow
Start 1 vs 1
See if this format works, does it feel awkward
Does the video format work
Does the exchange + interaction work
Of course it'll be missing the community aspect. Hopefully that is mostly an additive.
We can try this for 1 week
Bring in a friend
Try this for 1 week
Get feedback
What worked, what didn't
What did you like
Did your chinese improve
Bring in 3 more friends