It is better to search out one without chrome, if possible. It is true that it can be stripped, but to chrome or nickel plate aluminum, a layer of bonding metal is applied. If this is not removed completey, it does nasty things in the ano-bath. Since this is an air fitting, excessive removal of material is not advisable, so...
I say look some more. I think CCM make a 15* asa, I am sure lots of them are out there, they aren't really rare.