I think you're in for a lot of work trying to get the Kawasaki starter to work on a non electric start Honda. Does the flywheel of the Honda even have a gear ring? Converting from a step on the gas pedal to start to a key start is not a big issue. It's done frequently when swapping engines and souping-up golf carts. First thing I would check is the output shaft of your possible donor engines and see if the drive clutch will fit.