I think I'll have to wait for better photos before I can give any solid information. I have seen tip inserts like this on a few dha, but I have no idea what they might represent. They can be single, double, or as in this case triple (I have three, do I hear four?
). A talismanic function is possible, but I have no solid evidence that copper or brass, of which these inserts as well as the ones found along the spine of some dha are made, have any particular talismanic function. I am reluctant to say it is talismanic, because its a bit like the way archeoplogists call anything they can't figure out the purpose of a "ritual object."
Burmese? Thai? My guess is Shan (northern Tai).