That is a very interesting setup. I have a pair of great greys that I just can't get close enough to for my liking. I am very curious about these bait callers, how loud they are, and where you get them. I really think a quiet (SQUEAKER ) type would work for owls but I don't know much about them or if they are even avaliable. Great images especially of the hawk!
The lucky duck trap bait caller can be purchased off ebay, amazon, and a few other places. They run on 4 AAA batteries and last about 3 weeks. I noticed the other day when I was checking cams, I could hear it at about 50-75yds away. Of course there are variables such as wind that could affect that. The great thing about that is that it calls even at night when the owls would be most active.
It ain't complicated fellas. "Love the Lord your God with all your heart, mind, soul, and strength. And love your neighbor as yourself." Everything we do should be motivated by these two things.