There is, IIRC, some sort of warning required before flying their kids in a two-seat airplane. This may attract their attention. Not only are most experimentals two-seaters (giving a reduced choice of aircraft), from my long-ago experience with YA, most kids WANT to fly in the two seaters (because they'll probably get to fly the plane).
I would suggest the YE form be modified to include a permission block for the parent to check off if they're OK with the kid flying in a two-seater.
Ron Wanttaja