think of the reason for the clutch here. this is present so that the motor will be able to drive the wheel through the helical gear but when the bike is coasting or propelled by the chain through the cassette then the clutch freewheels and the motor is not forced to turn.
what if the clutch were locked? then the motor would have to turn all the time, how big a problem is this?
i got to thinking about this in a roundabout way. thinking of why the sprague clutch doesn't engage.
i see grease, lotsa grease. i was thinking why not spray the entire clutch, or the engaging pawls part of it with cleaner so the grease is stripped. would that increase the chance of the clutch engaging?
i think only Miles understands how they work, so if the bike is gonna be non functional anyway, why not go ahead and clean the clutch with solvent until it looks like shine on the bearings inside. then reassemble and put it back on the controller to see if the wheel will now pull when the motor drives.
if it will finally drive the wheel, then run it like that until the freewheeling part seizes up and you have to drag the motor along while coasting or pedaling. this is not a load carrying bearing, there are needle bearings underneath that carry the weight of the hub so they should be protected from the solvent and grease should remain on them permanently, but if the clutch will engage with less or no grease, then maybe the downside is only that you have to ride the bike on the throttle all the time, no pedaling. or coasting, but it may still coast yet.
if we are stuck with no ride because this clutch won't engage, i would go for the whole hawg method of fixing things. kinda like using a gear clamp to hold the planetary gears together long enuff to drive home like our #1 genius did.
if degreasing is not enuff, maybe go to the next step, physical abuse. slip a socket over the bearing and whack on it some, 50-50 chance you are whacking in the right way. worth the try imo.
or if you are into abuse already start with that. or both, whatever it takes. you got this far.