I'm sorry, I haven't had any problems with pinworms but the parasites I am dealing with (fluke) do not like an alkaline environment. Also, the Hulda Clark herbs seem like they would be a good idea. If they are localized in the intestine then whatever you take is going to hit them. There is a Hulda Clark group on curezone, people can take a specific Hulda Clark cleanse which is more concentrated than the humaworm product. I saw in an interview on youtube that hulda clark said that all parasites were killed with the (green) Black-Walnut hulls and she was making a new product more powerful than her tincture. I don't know if it ever came out or not. But, the one that can cause problems for some people at higher concentration is the Wormwood or artemisia. The three products that she recommends were green Black-Walnut hulls, cloves and Wormwood . I don't know, as far as safety is concerned for the kids maybe just going a little more in the Black-Walnut hull direction and not taking the Wormwood at first. Then if nothing happened start using it.
I am thinking of suggesting a zapper for you to investigate, but I don't think it will zap what is in the intestines. Maybe someone else here knows.
I would stick wth the diatomaceous earth if it were me. Theoritically it seems like that would be the best thing to take.
I would try the herbs before I started taking some other meds to treat the pinworms though.
I hope this was helpful.