You could have several laying workers in the hive at one time. Installing a frame of eggs in hopes they will raise a new queen can work on the first...
I would put a trap out cone on that tree trunk, use a piece of 1/4" plywood to cover the hole. It is flexible enough to bend around and half way form...
Looks good! Need to get the bit hive entrance closer to the base of the cone, if that is as far a s it will go add a bridge for them to walk on. Good...