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I like your idea because then clean up will be easier, but they probably would use those bars. Maybe you can move the ladder towards the window and make it so that the bars could be removable for cleaning, or if you see a bird get injured.

I had a couple ideas, but you may already be planning on them. So, re-doing the roof with added ventilation is a great idea. I would get 1/2 hardware cloth "screens" secured very well to those windows frames, and then leave them open in all seasons (maybe not all of them in the winter...