The only thing about "clear" anodized is that even if you polish it before it's anodized it still comes out looking grey. Also if it were me and I were to have a part that is going to see weather and abuse from chemicals and rocks, I'd opt for hard anodized but you only have the choice of 3 or so colors in hard anodized.
Edit: If it were up to me I'd opt for powder coating, your local powder coating shop will have contacts with professional paint stripping companies and can recommend the best process for the best results (I'm guessing vat dip).
Yeah, I'm reading that anodizing must be done correctly or it can easily yellow or gray.
I have also read that it must be thick enough to matter or it is wasted energy.
Powder coating appears to be cheaper as well.
I may go back to the powder coating shop that did my headers and see what they can offer.