Those are kinda what I mentioned originally. The first is for roller shades, the second for curtains. They're good at what they do, but that's not blinds.
I'm fine with them being battery powered. The nice thing about having a window right there is that it can have a small solar panel up high to recharge if needed.
I've got several sensors and even a deadbolt that run on battery, and they go for over a year before needing a replacement.