Here's another idea: I have a product I bought a long time ago called Blind Brite. Got it at Bed Bath and Beyond. The theory behind it seems to be the same as rim ice. The most popular application is to wipe dirty, dusty window blinds or ceiling fans with the product and it leaves behind a barrier that breaks the elctrostatic charge which attracts dirt and dust. Unlike static guard, you must spray and wipe. It also has a wider range of applications, for instance, TVs, wood, vinyl, and specifically mentioned, auto interiors.
I originally bought this product for use on my engine to reduce dust build up but i stopped using it after no noticeable retardation of the dust.
I'm going to give this product another shot this time on my wheels, now that I have ones that allow me to get my hand in them to wipe the insides. No fear of greasy messes because you spray and wipe Blind Brite. I'll try using it for my next longer trip. I do not expect it to retard brake dust build ups that come without still cleaning the wheels fairly often. Maybe it can stretch the cleaner periods a little longer.
Wonder if it will yield similar results as this rim ice stuff. BTW, this stuff is a 16 oz spray bottle, I'm betting it will last longer than the little bottle of rim ice.
Will give it a shot, I don't expect much, just doing for fun.