As for your rust discussion, it's true the wraps trap moisture and promote corrosion. The ceramic coatings are a good barrier to corrosion on properly prepared substrate. Common practice with headers (or complete eshaust systems for that matter) is to coat both the inside and outside for protection (also additional heat barrier).

Your range of colors with ceramic are fairly limited, though at SEMA last year one vendor had many more colors available than you usually see, so that's a changing market. Powder coatings have expanded the color selection significantly in the past decade. .

While there's no reason you couldn't have a front clip ceramic coated (though size might be a problem for most coaters equipment), I think you'd find powder coating more economical as well as easier to find a qualified applicator.