here is what i came up with

Unfortunately, I am not having a good nesting season! I had a pair of chickadees nesting. They build a nest and she was about to lay her first egg (which i was waiting for... to put a hole reducer) The house they picked had a big hole allowing HOSP to enter. Despite my 3 day attempts to chase away sparrows, I end up loosing the female chickadee.
The HOSP killed her when she was in the nest. And they did not even claim the box after it.
I was thinking how to trap them since I had a couple incidents with sparrows escaping boxes with Van Ert trap. (My fault)

And here is what I thought: Why not recreate the nesting in the box - the bird on eggs. Make it look as natural as possible to entice the HOSP to enter faster, banking on the aggressiveness of those birds. So I put a fake bird in there with a fake nest! Thanks Hobby Lobby.
It worked, in spite that the box was empty for quite some time I guess the male sparrow was checking on it time to time. Here is how it looked. I will put an image here.

Now that is entertainment at it's finest. This is a good example of how controlling sparrows can be fun!

Good work!