I have this one, and it works great for this purpose:

https://www.amazon.com/USB3-0-Sharing-Printer-Scanner-Computers/dp/B077LKGZGZ

It's a completely mechanical switch and draws no power. In/Out are both on the back. It's plastic and not the prettiest, but you could spray paint it black or white quite easily. It also has mount holes on the bottom for screw heads.