KVM Switch for Rift - Machine with both NVIDIA & AMD discrete hardware

I do graphics development for our project and need to verify work across multiple IHVs.  I have an NVIDIA card and a AMD card in my workstation that both work correctly when manually moving the rift connections, but that gets tedious / annoying.  I've tried connecting one rift to each card, but only one will show that that it has a valid HDMI connection (depending on order attached or slots the hardware is connected to).  Our software does the right thing, but it appears the Oculus software doesn't like this setup.  It's clearly an outlier case, so it's not that surprising.  Given this, I'm looking at getting a KVM to do the switching. Anyone have good luck or issues using a KVM for this type of thing, or particular recommendations / alternatives?  (FYI: Windows 10, GTX 980 Ti and R9 290)

Thanks,
Jeremiah