i think you should ask the TEACHERS to ask the nut-free kids PARENTS to send a list of appropriate nut-free snacks home with everyone. i totally get why you can't put nuts near this kid, but it's also a huge responsibility to drop on parents who aren't familiar with the issue. not only is it a lot of work for you, but you have no t been educated by his doctors the wyat his parents undoubtedly have. you can't be held responsible if something accidentally goes in there all nutty. :)
this is especially true if they also have health stipulations on snacks, as i know you do, too.
and luci is, essentially, allergic to dairy. so special accomodations need to be made for her, too, you know?

we have a few wheat free and nut free kids at school, and their parents send home lists with their classmates. it works beautifully.