I think that can be improved upon and is workable. If you have, for example, a period of one hour on a Tuesday every week when you take these votes, you can assign windows of time, so that during these five minutes of that hour, X, Y and Z members can send their votes in. That's not publicly broadcast; that's just decided in the moment. Then the bad guys will know the window overall, but they will not be able to predict these specific windows of a few minutes when it is valid for certain members to send their votes in.
On June 11th, 2020. See this statement in context.