Maybe this is the answer? Even though I don't need the screen, the footprint of a smartphone is smaller than almost all SBC supporting the above requirements.
Women in tech loved the concept: instead of carrying a laptop they could use the medium-size tablet we provided and have a wireless mouse and keyboard both at the office and at home. We also provided a monitor for both home and the office.
The project didn't lauch commercially because in our tests the microusb to micro-hdmi cables caused a lot of issues and management decided against it.