I don't have a problem with unstayed pocket luff rigs, only stayed pocket luff rigs like moths and mainsails that can't be dropped with the boat upright. So long as the kid or a rescuer can drop the sail easily.

Only other consideration with unstayed rigs is that there is a device to keep the rig in the socket during capsizes. A simple rope and sister clip arrangement would be enough. Not sure if this should be in the rules, maybe a separate clause is needed to cover these safety issues.

Safety - Sails must be able to be dropped easily in all conditions while on the water, mast must be attached to the boat, etc.

Just a little history for those wondering where this stuff is coming from, I used to umpire junior teams racing and being able to drop the sails in ALL conditions while on the water was a necessity.