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My Grumman aluminum canoe had some stainless steel to aluminum corrosion where the seats were fastened. It’s about 60 years old.
But I recently helped re-rig a sailboat that had last been done 20 years ago. The rig is all aluminum with stainless fasteners. When it was last rigged in the 90’s the owner bedded everything using marine silicone. All fastener threads were smeared before fastening. It’s a saltwater boat and sits all season on a mooring. Everything easily came apart and there was no evidence of corrosion. I’m sold on this process.
My alumacraft has stainless fasteners on the transom and from the factory they isolated screw and nut heads from the aluminum using nylon washers. That’ll work.
If you are overly worried check out Non Ferrous Fasteners. They have all kinds of cool hardware.