Jay-
You cannot have a wheel anodized that has any paint on it. It must be totally stripped and re-polished before they will dip it. You can't strip the paint off of just the petals/spokes and leave the rest. You are going to have to have to mask and repaint the centers completely afterwards. I would try to get them unpainted, if possible, otherwise, it will not be a cost-effective process. The last time I did this with a set of forged Fuchs, it was $100/wheel to get them fully polished, $40/wheel to get them anodized, and then your time and material to mask and prep, prime and paint the centers. This was quite awhile ago, and costs have gone up, plus the shop I used for anodizing here in SD has been closed down by the EPA. You might as well send them to Al Reed in Anaheim and just pay him to do it, honestly.
The only cheap, do-it-yourself way to get that look is to bypass the anodizing and just strip and polish yourself, then use Scotchbrite pads to dull the bright finish to resemble anodizing. There are several threads on the Early S Registry and Pelican Parts forums about doing this. Search for "Bob Tilton" and "Scotchbrite" and you can probably find them. I did a set of 6" Fuchs painted in the early 4.5" Fuchs pattern for my '67S that way and they turned out pretty well, as long as you were 5' away.
HTH,
TT