You can get a USB switch and a 4K HDMI switch for about $40.
I don't currently have a 4K HDMI switch, but my HD switch works just fine. Sure you have two buttons to push (USB and HDMI), but it works and it's cheap.
I don't currently have a 4K HDMI switch, but my HD switch works just fine. Sure you have two buttons to push (USB and HDMI), but it works and it's cheap.
And this for my usb stuff: https://www.amazon.com/Plugable-One-Button-Swapping-Between-...
It's under $25 total and both work perfectly well.