I'm doing the exact same, steam streaming always was slightly too bad for Latency and in some of my games that wouldn't feel well (Kingdom Hearts, Expedition 33, Furi,...)
So I got an optical HDMI cable, and back when I was on windows there was a script to switch the video output when bigscreen is ON.
However when I switched to Linux, the performance was horrible If I was using screen mirroring for some reason (probably a Nvidia GPU issue?). So I got a script running that uses KDE screen doctor to disable the HDMI output and when bigscreen runs it enables the HDMI and disable the Display Port. This also had the advantage of changing audio automatically :)
Now my next step will be to get a CEC injector and do TV wake and input swap when in big picture.
Indeed the 5'6" height is in French foots/inch. One of the most infuencial thing Napoleon made possible is to spread the metric system across conquered land, which would make the british/French system confusion irrelevant if they got it. (Napoleon was actually 1m 68, which is correct everywhere that uses metric across all time)