I've seen stainless steel ones on cruisers before, but I think george might be thinking of something like this:
http://www.kandpengineering.com/
http://www.americandirtbike.com/k&p.htm
Not sure if they're the same thing as I assumed the cruiser riders chose them because they just love having things to polish
They claim to be much better than the standard filters by the looks of things and more environmentally friendly so perhaps they might be useful. I'm not sure if you can get them for the africa twin though as it's the same filter used on some other bikes and these things seem to be used by sport bike riders too, perhaps there is one that'll fit.
If you get a list of bikes the standard africa twin filters will fit then do a search for 'stainless steel micronic filter' you might be able to find a match (though it'd be worth measuring it to make sure it's the same size as the regular filters and will fit on the bike). I can see how this might make sense if you were doing a massive trip as carrying a couple of spare inner filters would take up less space and weight then you could get them cleaned and re-use them when the opportunity presented itself. They do seem quite expensive though.
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