I know it's suboptimal, but can't you do the split on the macbook? The TB port should output pure DP, so you plug that on the DP-in on the KVM. You plug a secon

I know it's suboptimal, but can't you do the split on the macbook? The TB port should output pure DP, so you plug that on the DP-in on the KVM. You plug a second USB-only cable that goes to the KVM USB in.