I forgot that I use Twitter sometimes and have pictures of another Moonlander experiment: mounting it to my chair! https://twitter.com/petersergeant/status/1356057651931537408

I did eventually get parts for both sides. One of the flexible arm clamp tripod mount thingies was not stiff enough to hold the keyboard up, but the other one was great. Since they were both the same part from the same order... it's kind of a crapshoot as to whether or not it will work. But I will continue to experiment.