At this immediate point.. maybe...
I love the look of BLACKFIRE Crystal Seal on white (as well as the classic Klasse Twins, Collinite, and some other brighter waxes).
If you are asking if we could do a Montan wax for white, the answer is yes. But what, if any, advantages would it have in the market place. We could always put some hyper-reflective polymers into, as well as Wet Diamond polymers (maybe use an acrylic blend like in the metal sealant) and then add into the montan/carnauba.
Keep in mind that BlackICE took almost 21 months (like a week short of it) to develop. If there is going to be a product for lighter cars, it would already be in development and I still wouldn't tell you...