Helicoil

[limax2]

I wouldnt use brass on stainless steel, in fact I wouldny use brass at all

I'll admit I'm not up to speed with galvanic corrosion but I made some brass nuts for my FZS600 exhaust (M6) some years ago and had no problem removing them since. They are just on the standard studs, not stainless though. I recall in my past life we used brass nuts holding the exhaust manifolds on lorry diesel engines. So I'm wondering if there is a reason you wouldn't use brass at all.
Maybe I should look up a chart of the reaction between dissimilar metals.