Okay, so, consider: child Kiriya turning into a tricycle instead of a motorcycle...

...only this never happens in canon and would actually be impossible because he had to have an operation as an adult in order to be able to transform into a motorcycle in the first place. (And using the transformation belt without an operation is kind of sort of just a little really fatal.) Can I fudge it and make this magic happen anyway, just for the hilarity of it all?