Make sure your painter COMPLETELY covers every inch of surface with that clearcoat... at least 2x...
I just tuned into this saga and could have warned you about the anodizing of castings...or the bad news about trying it...(btdt)..
As for the nickle/zinc chrmate conversion thing, have a lot of experience with it also, lots of the stuff I design in industry gets that finish.
The problem is tho, most of that stuff never sees water, or elements that your rims will see...acids picked up on wet roads caused by car emissions, and other things similar.
The aluminum in this state now is very much like a battery, with the coatings, and any moisture will set the galvanic action in process...
I've always liked that color shift and look, but when it's applied to polished metal it's more dramatic.
be very careful mounting tires now, if that coating and the paint finish is compromized/nicked; any damaged area will begin to decompose..turning into a fuzzy powder....and pitting.
shoulda went powdercoat... there are many compositions, and I've seen some that do mimic your Ohlins, they just take 3 layers...siler base + candy gold clear + clear topcoat.
http://www.tiger-coatings.us/index.php?id=1295&tx_pressdownload_pi2%5BshowUid%they are called "dormant" coatings, and they even have flip/flop chemeleon stuff now...
my current coaters use this:
http://www.tiger-coatings.us/index.php?id=1295this, with a clear/gold top coat might do it....and the powder is reletivly cheap, could do those rims with less than 2 lbs...
http://www.powderbuythepound.com/SUN_GOLD/liquidpowdercoats stuff....
http://www.liquidpowdercoats.com/oldwebsite/services.html]img]http://liquidpowdercoats.com/gallery/Gallery/Everything%20Else/slides/lpcsyr1.jpg[/img]
shocker yellow...hmmmmmmm
wow