Not sure why I didn't do this sooner.
After opening the window, putting the pet door in and turning a few knobs (that is already 3 steps), I added the foam weather stripping and closed the window.
Kracken wasn't sure how the whole thing worked, but had it figured out in the first hour. He was highly motivated to be outside.
Rudy took a
After a week he figured it out and now they both spend most of their time outside. It's not the screened porch, but it's a good substitute.
And though we don't have deer and rabbits, we do have squirrels, dove, cardinals, sparrows, and mocking birds in the tree outside for them to watch.