Reverse KVM KVM switch for 1 comp -> 2 workstations in a house, different floors

My main computer is in the home office area on the main floor of the house, with 2 monitors connected to it. The problem is, sometimes the house is very noisy and I'm thinking of setting up a secondary workstation in the main bedroom upstairs (which is directly above the current location).

So I need a KVM solution that will let me switch control to either location from either location. If there is a wireless solution that works extremely well, I'll consider it, but I'm more inclined to trust KVM over Ethernet (or fiber-optic). Since the locations are directly above each other, I can drill a small hole in the ceiling or the crown moulding, for the cable penetration.

I'm seeing a lot of options out there, but none of them seem to be what I need - either KVMs designed for "local" application", or "KVM extenders" which don't give me the bidirectional control (i.e. I can get the signal extended to the other floor, but what happens if I need to switch to the other location?).

If someone can recommend a solution that works for this specific configuration (2 locations separated by 25-30 feet, with Ethernet "bridge", and the ability to control either location from either location), it would be greatly appreciated!

 

Another issue with the "extenders" is that I really don't want to (1) pay separately for a KVM and an extender and (2) deal with compatibility or technical issues. I'd rather have 1 solution that has 2 "halves" separated by a wired "bridge", with switching on each end.