The direct positive paper looks like it is just as easy to develop as the RC variable contrast paper. This is a big plus. Neat stuff, worth a serious look.

The pinhole is critical - you take charge of that and make all the pinholes the same. If kids made pinholes they'd be big and small and there would be more exposure mistakes.

So you send 5 kids out with 5 pinhole cameras and maybe 3 from the group comes out OK. You could still make copies just the same from one of the prints that came out to another sheet of direct positive paper.

Your original plan is fine too, if you want to stick to it. You make prints from the best paper negatives. Guaranteed results.