OK I have no idea what I'm talking about, but crazy idea, maybe you stain and clearcoat the wood, and then overcoat with Invalid Link Removed... Not even sure this is the right thing, there must be a mostly clear paint with sparkly bits in it... this might not work, might look too much like the sparkles are floating on top of the wood, but... maybe at least that thought will get your creative juices flowing? The basic idea being to put the sparkles over the wood, instead of in it, but in such a way that it gets the effect you're looking for as sparkly wood...