There is strong symbolic connection between sharp weapons and fire, if this suits you better than the wand/fire connection. Wands (through their symbolism as bridges and connectors) are as often seen as air as fire. Is your sacred space to be permanent or temporary? In any case what you need is a symbol of sacrifice, for every place of sacrifice is an omphalos-a place from which the universe is nourished. And this needs to actually be the giving up of something that means something to you--pigs blood from the market is not going to do it . Many people use money these days, they give it to charity and use a coin to represent it. Good luck with your search.
