I suppose you could try one of the really good automobile waxes?
Not the low cost ones but the high cost ones made for custom cars finishes.
I've had good luck with Meguiar's "Gold Class" but Mothers makes some equally good waxes. Keep in mind, I own a G5 Deluxe so my bike is gloss black and chrome.
I'm not sure how a high gloss wax will look on a flat finish like your bike has.
Speaking of Military flat finishes, they don't look glossy. In fact, the duller and crappier they look the more authentic they look. After all, they aren't trying for high visibility for the enemy to take pot shots at.