I think this is a really great idea. I do not know if I would buy it, since I do not really need it, it is more like a nice to have.
Integrating some ports and “dock” Features would be indeed nice since you would always have them near you and not on the PC. Adding some USB A&C Ports, SD Reader and definately HDMI/DP should be no Problem and not really add extra cost. I would prefer a 28" screen with about 2k, since 4k would be really expensive and it is really hard to Power when you want to do demanding graphics Tasks