If I understood correctly, there are two issues. The first is the quorum so that members can hear the testimony. The second is figuring out who is supposed to make up the quorum.
Whether we like it or not, the fact of the matter is that, under the rules of Parliament as a whole, the majority of members will be members of the government party. I think that's a fact. I don't understand how we are not able to reach this conclusion. In a normal process, I don't feel there is going to be a problem if two members are supposed to be from the government party.