so I found these browsing around an argentinian moped forum. this is a garelli clutch, but it works with any rubber clutch...
all I can read on these forums is whatever google translates it into, as I don't read spanish, but I thought it was pretty interesting.
it seems like all you do is cut a channel around the outside middle of the clutch and then run a wire/brake cable around the channel and weld it together at the ends.
but how exactly would this help to engage later?