https://github.com/tiny-pilot/tinypilot/wiki/HDMI-Capture-De...
Heck it could even be powered by the USB host. It would be an "active cable" that doesn't require any custom software. Would be super convenient to carry with a laptop for data center technicians.
I still don't think I'll use it though. I can understand you're trying to make a business out of it. But the password protection feature is one that's too big to do without even in my home network.
For the other stuff like remote mounting drives I can imagine you're asking money for. But the password is pretty essential IMO, as is HTTPs. And the license drives the price far above $100.
Nevertheless I wish you luck with your business!
Fwiw I think pikvm is going the same route now, selling premade hardware. It's nice but the price is just too high for hobbyists. Some of my servers didn't even cost me $200 new and that's with iLO included.