While it's not a KVM, but rather just a USB 3 A/B switchbox. I did find this inexpensive option on Amazon that fully works with the K70 RGB. Do note that you'll need to use a 5V micro USB DC adapter with it - not included.
Ugreen USB 3.0 switch 2 computers, 4 USB devices.
Also worked with my gaming mouse, and webcam.
With regards to my monitors, I used HDMI on the 2nd (non-gaming) machine I was using, and just manual swap using the display's controls.
Not a 100% perfect solution, but it does what I need it to do, and was far cheaper than a full feature KVM.