I have loads of aluminum and carbon arrow shafts, those could work if I find a diameter I like I would think.The aluminum arrow shaft being hollow would allow for quick heat disapation.They already have a threaded insert on one end too.Just cut them to length and plug up the end with some JB weld.
The RTV that M-F sells for making molds would be a dynamite product to coat a wooden dowel with.Way pricey stuff though.
These are just some ideas I'm bouncing around as I have yet to start another addicting hobby.Rod building being my first.