It's great to see a solution that works using some basic hardware and existing blinds. Not only does that make it incredibly cheap compared to commercial alternatives, but it also doesn't require implementation at time of construction (or a major renovation).

I recently have been working on the technical aspects of building a new house for my aging parents. We went with Lutron's Serena shades, because we also used Lutron's light controls and they feature both Nest and Alexa integration. Construction hasn't been completed yet, so I can't fully report on the final result. But, my initial tests have gone well and setup was simple. For reference, the per-shade cost is around $600 installed. Basic shades of similar quality would likely be $150-200 each, so it's a fair bit more but not outrageous.

I considered a DIY approach, but then thought about the primary users and realized an off-the-shelf solution would be best. Even in your own home, it's hard to overstate the importance of reliability and ease of use for your spouse, kids, guests, etc.