not really.....well, not without the finish looking like garbage. Wood is an insulator by nature and conducts no current to allow the powder to stick. If any way possible...you can heat the wood to the cure point and try to powder coat it then. I've tried this before just for giggles....it doesn't look very nice at all. Stick with your current process. I believe Caswell offers a copper conductive spray for non-metallic items that is used in the plating area, but I can't imagine that it can't be used for your application as well.
(sidenote : there are other ways of coating your product, but they aren't what you are looking for. monomer parylene deposition comes to mind, but it would be of no benefit to you)