It would be a matter of privilege if they couldn't get into it. I hadn't thought of that as an issue, but they don't have to do it from their own riding; they could go to the provincial capital or a nearby city in their constituency and do the work from there. They don't have to be in their house or in their office to do this, I don't think, but it depends on what restrictions the House chooses to put on it.
Again, I don't think there's any reason you couldn't have a group of members of Parliament in one place who are all participating in the discussion like this, maybe all in your office together. Technically it could be done that way. Other members might not like it much, but I don't think you would be required to be in a room on your own for this to happen. I don't know how anybody could tell that was the way it was being done, if the other people were out of sight of the camera.