DD1 usually has a yoghurt after dinner. No real problem there except DD2 (18 months old and allergic to dairy, and refuses to eat soy-based food) has started noticing that DD1 is eating something and wanting a taste.
A few nights last week I gave them both little pots of jelly, which went down quite well, but I don't necessarily want to get into the habit of that either.
So, if you had to give something to DC after dinner, what would it be? With the provisos: dairy/egg free, not fruit (as they get plenty at other times of the day), doesn't have to be "dessert" as such, just something for after dinner.
Custard made with rice milk? You can always make rice pudding, semolina and cornflour based pudding with with all the alternatives to dairy. What about sorbets? You can make a really easy sorbet by whizzing up fruit and freezing, I know you said no fruit but if it's only because they won't eat fruit then sorbets will go down a treat.