I wonder if swiftech use brass for the top and galvanized it using nickel/chrom will solve this problem.

I dont know but brass is cheaper than aluminium right? And all the barbs we are using use brass galvanized with nickel/chrom. Besides we even use brass and chopper in our radiator.

There a pimp motorcycle shop at my homeland that can galvanized metal. Some of my friend plated some of their motorcycle part with chrom at that shop and it aint too expensive.