After a bit of head-scratching he thought about repurposing the four unused wires on one of the RJ45 Ethernet connectors ... holes we love the serial port used on this Dockstar.

It sports a full-function USB-C port, USB4, HDMI 2.1, and an RJ45 network port ... allowing you to customize it to your needs. An RS232 port is available for $14, a single-port KVM for $48 ...