Stainless Steel Wheel Spindle
Don't do it, any self respecting engineer knows that Stainless is no where near as strong as High tensile steel, thats why the manufacturer doesn't make their spindles from stainless.
Yes it looks pretty, but if you want to risk a real wobbler down the outside lane of the M6 then go ahead. Oh and by the way watch out for that public liability insurance jobby!
Why not just clean the spindle more frequently, coat it with a smear of chain wax or better still paint it with clear lacquer. At least you'll be assured its not about to let go. Titanium now thats a different thing all together and far more 'trick'. Don't forget the public liability insurance, accident found to be caused by non-standard parts being fitted. Sorry to spoil your fun.