I tried the one with the wheel for a while. Replaced it with the simpler version at the first opportunity. They both work, but I found the simple version less bulky.
A mate (Monza/Breva rider) was working on another simple version while in between jobs - the ones produced by the CNC machines he built were fine, but then he moved on to 3D printing, & before he could sort out the materials & design adjustments, he landed a demanding job, so that looks like it's on the back burner. His 3D prototypes worked well, but were fragile. His Breva had a disturbing tendency to throw the dipstick - but mounting one of his throttle locks on the dipstick prevented it from unwinding - problem solved.
