Dant98 did something along those lines, but with LED lights (I think). It's been awhile, and I don't know if he still has it installed.
I can't remember which trim levels for what years had how many bulbs, but I know some lightbars had two bulbs and some had four. If you only had two, there's no point to trying it but for four, it might be possible. I don't know how you'd set up a sequence though, I'm not heavy into electronics.