@gwaitsi
I have a 4 port HDMI & USB KVM. However, in your case,it might be easier to bring the pfsense computer upstairs. Also, my Qotom has a serial port. If necessary I could use it. Running a serial cable isn't hard. In fact, you can use an Ethernet cable, with Yost connections. You just configure a DE-9 (It is not a "DB-9") connector for each end as needed.