networking – Extend PC downstairs, to monitor, keyboard, mouse on second floor with low latency

So, I have a unique situation. My main PC that I use as a workstation for video editing and music production is moving to a new office in the basement. My girlfriend will never accept me being down there all day, so I’m going to have to find a way to continue working upstairs on the 2nd floor. I don’t want to buy a second computer/laptop, as I’d have to buy more licenses for software, and its a headache I don’t yet want to deal with.

So, that’s led me to the idea of extending an HDMI signal upstairs to an second monitor (or pair of monitors, if possible). The question is, how to best extend that signal.

Our modem/router is on the 1st floor, and is connected to my PC in the basement via ethernet. I have a Gigabit port on my motherboard, so that’s an option if it helps. Running ethernet to the basement was easy, but running it upstairs would be too hard to deal with.

The two ways I’ve come up with so far are, 1. Use wireless HDMI extenders, but I’m afraid those won’t extend over 2 floors, and the latency/video quality will be almost unusable. 2. KVM Switch with KVM over IP support. This seems more favorable, but now, I have no clue how to extend the Gigabit ethernet to the second floor. I know I’d need a Gigabit PoE switch, but how do I then wirelessly transmit that signal to the second floor. Wireless access point?

Any ideas, recommendations would be amazing! I know little about gigabit connections and the options available. Is it worth it in the long run, or should I just settle for HDMI extenders?