I worship ur ingenuity. i did something like this once, but a lot more ghetto, involving welding foot bars on the bottom of a frame. i could ride it weel, but then again, i’m pretty good at BC. so keep at it, i wanna see u bust out that sheeet
I have ridden one of these before (without a brake) and they are possible but tricky. Having a brake would make it more interesting. One of the difficulties without a brake is that you can only slow down by stopping pedaling, coasting for a while and waiting till you lose a little momentum. It is really important not to go full tilt so that you have a safety margin in case you need to speed up to keep your balance.
From memory it was not too bad to stay balanced as you accelerate, deceleration was the killer. It helps a lot if you can already coast.
If you know how to coast or glide a Freewheel unicycle should be possible.
I agree that a brake is very handy here. However you can always brake by turning or slaloming. That is the way skiers brake. A freewheel KH29 unicycle is definetly one of the things that I dream of owning and mastering one day!
For right now I am still working on one footed pedaling with my weak foot and going down stairs backwards!