I always file the lip off CSPC front ders, which is what I suggest you do. If you are careful to file only the lip there will just be a small "cresent" where the plating will be gone. Just fill this area with yellow or red enamel, or whatever accent color will go with the rest of the bike.

I think it's a good practise, as it allows better adjustment to clear the chain in high gear without risking rubbing the back of the crankarm.