I wouldn't worry about it - when the stainless bolt takes out all the threads on the float bowl Deelip'll be able to helicoil it back to standard and that'll fix the galvanic issue. If not he can always put in a longer bolt and screw a nut on the top.
That's a joke by the way. I've used stainless allen bolts in similar circumstances for many years without any issues. Usually a bit of grease on the bolt threads and frequent strip downs trumps electrode potentials.
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