Curved wall Window Blinds
You might want to check out how I treated my blinds (I got wood slatted 2 inch pull-up blinds)...and used 2 pair of "tie-downs" for EACH blind. 1 pair above the little peekaboo window, and 1 pair below it---so I can choose to cover the little one or not. In the "Member's Photo Gallery", you'll find my FIRST 2 photos, and one of them shows clearly the blind's curve to the tiedowns.
P.S. Please remember looking at these pix, that this is a "work in progress" and lots of what you are seeing, is UNFINISHED.