You can get Stevia and xylitol in the uk, I bought Xylitol from a health shop and Stevia on line. I can’t remember where I got it from, but there appear to be plenty of stockists http://www.google.co.uk/m/products?oe=UTF-8&client=safari&q=stevia&hl=en&bl=/m/search?q%3Dstevia%26ie%3DUTF-8%26oe%3DUTF-8%26hl%3Den%26client%3Dsafari&source=search&channel=products&ei=FVrrTaDFHYKX8gO126P4AQ&ved=0CB4QzQM
Have you tried making savory snacks?
Almond meal/pulp left over from milk and flax meal are a great base: http://veggiegrettie.com/2011/03/13/almond-pulp-crackers-guest-blog-from-elenas-pantry/ I will cook mine in my oven, on the lowest rung, on the lowest temperature setting.
Or I made these with buckwheat flour & oil: http://www.recipetips.com/recipe-cards/t–1973/homemade-crackers.asp
Either of these recipes could potentially be adapted slightly to become sweet crackers.