I'm almost afraid to mention this here. But...
They also make dutch ovens in aluminum. For backcountry camping where you can bring some gear, but not a lot, they've made aluminum ones for decades. They're lighter and as such their heating properties are different but not dissimilar to cast iron. I found that baking in aluminum was okay, as you can turn it into an 'oven' type thing by raising your pie plate inside and just creating an oven. Things tend to burn more in aluminum and you get hot spots where you place the coals sometimes, so you should practice with cast iron, then try plying your skills to aluminum.
I'm not sure that you could polish the outside of an aluminum dutch oven with nuvite, but I'm sure someone would try it if they didn't think the nuvite would seep through the pores of the metal and get into the eating area.
There, get yer fix on cooking with aluminum.
(I for one, would prefer cast iron in almost any situation for this. Aluminum is good for things like canoing and boating trips or those things where weight is a primary factor)
j