No pedals?
So the pullstart would be on the opposite side, right? You'd still need the jackshaft to swing the sprocket to the right.
Seems do-able...Ifff the HT engine had enough torque for a standing start, and the clutch was strong enough.
Of course, you'd have to rack up a decent gear ratio combination, using a rear cassette with 38 teeth in first gear.
Engine has a built-in 4.1:1 ratio.....
10t engine sprocket/17t on jackshaft = 1.7:1.....
9t on jackshaft/38t on cassette = 4.222:1.....29.43:1 in first gear...
9t to 26t = 2.9:1.....20.21:1 in second gear.....
9t to 23t = 2.56:1.....17.77:1 in third gear.....
9t to 20t = 2.22:1.....15.47:1 in fourth gear.....
The gearing combinations seem to work out. Unsure if any alignment or chain-jumping issues would arise. I guess you could add side flanges to the 9-tooth sprocket, or add two "sandwiching" sprockets as "jump stops".
Here's what I'd do, if I wanted no pedals:
Install pullstart.
Install complete SBP shift kit with cheaper freewheel mechanism(HD freewheel not needed).
Remove pedals and install foot pegs.
Then if the need arises, it's a simple matter of reinstalling the pedals.