I already have 90% of the value I need for ~25$ plus 3$/yr in coin batteries. Specifically the Xiaomi Aquara Zigbee sensors. Both will last over 1 yr on a CR2032 and pull into HA.
I can get an IR motion sensor with luminance, temp, and also add another temp, humidity, and pressure. That's great and all but that can already be done today with comparable products. Or use ESPHome to do whatever customers need. The value proposition you have looks to be a bunch of sensors that can be pulled into HA via ESPHome.You'd save users time from having to measure the board and model a structure around it. If you're leaning towards marketing towards DIY customers, a 3d file for a printable enclosure or the start of a printable enclosure would be nice.The latter you maintain more control over products and you can tightly integrate the sensors with the hardware, firmware, and design You will have a decision to make whether you leave it for more of a DIY audience to add via soldering etc, or further your product assortment to all a non-DIY option to add sensors that you sell. But easily allow the addition of more expensive components that users can add themselves. I think it's smart to put the more economical components on the board, as you've done.You've learned that you must have a battery option but also an externally powered option as well. Reaching out to users to do research (like here on reddit) is a must.Being in product management myself, here are some thoughts - while you didn't ask for the, this is the Internets:
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