A great article here and worth a read -
http://www.skillforkids.com/0-3-years/benefits-of-exercise/nutrition/10-0-3-years/63-benefits-of-exercise/67-nutrition/1219-Food-Choices-for-Children-with-Coeliac-disease.html
Don't forget that there are great GF substitutes for breadcrumbs such as rice crumbs or corn crumbs - some familiar ones from Orgran http://www.orgran.com/gluten-free,
Caslare http://www.casalarepasta.com/, or indeed GF bread crumbs - maybe try Macro wholefoods market brand or LifeStyle Bakery http://www.lifestylebakery.com.au/page.asp?parentid=2&parent2id=81.
Milo is not an option because of the barley it contains however what about Nestle's Chocolate Nesquik?
http://www.nestle.com.au/OurProducts/Documents/Gluten-List-July-2012.pdf
Massel do powdered and liquid stocks that are gluten free
http://www.massel.com.au/products/gourmet_plus.shtml
Eskal do gluten free ice cream cones
http://www.eskalfoods.com/eskal-gluten-free-products-1
and don't forget, a lot of products are gluten free by ingredient so it pays to make sure you are reading labels correctly. The Coeliac Society of Australia is a great resource and individual states offer label reading workshops or supermarket tours. Check them out.