The Aquilon RS4 can do DisplayPort 1.4[1] up to 32.4Gbps (HBR3). You will need two DP1.4 output cards[2] and two DP1.4 input cards[3].
Probably easier & cheaper to do switching in HDMI 2.1 though.
Aquilon is expensive, but the nice thing about the units is that they literally allow you to have a seamless switching experience (everything else will blank out the screen, and cause it to disconnect for a few seconds while everything resyncs).