Not a good idea. I was at the Allentown show years ago and a guy had the same "tool". I thought to myself, "I see trouble ahead." I was playing a game of Theatre of Magic while the guy took his game down. He used the T-tool. I hear a HUGE BANG! Then a few choice words. I look over and his game is side ways on the hard concrete. I didn't bother to hang around and see the damage.
Just looked at your pics again. I believe the guy actually did it the other way. He had the T up top and balanced on the tiny bottom part. Your approach looks more stable. I still wouldn't use it, though.....at least not on my games
Duane