Stainless does indeed react with Carbon. The following image shows the galvanic relationship of particular materials (graphite = carbon). Monel is one of the Cu-Ni alloys on that scale. To avoid galvanic corrosion between dissimilar materials, you want to choose materials that are close to each other on this chart. As you can see, Aluminum Alloys are almost as far away as they can get from graphite...the aluminum, being the more active of the two will act as the anode and will corrode at a high rate. 316 series stainless steel is what's usually used in marine application and most common stainless fasteners but even it is a bit far away from the graphite - it will rust if in contact (stainless is not impervious to everything...soak it in concentrated bleach for 24 hours and then water for a few hours and you will see!). 304/302 Stainless steels are the poor man's version of stainless (we typically build machine frames from 304 because it offers similar corrosion resistance at a reduced price from 316).

What you really need are platinum rivets...they'll stand up well with that carbon.

I used to be a cathodic protection system technician for a gas company....I would watch over the systems and methods used to slow down the corrosion of steel and cast iron gas pipelines... so I got a pretty good education on these things.

What the guys are talking about with the fiberglass is for it to act as an electrical insulator. All of this galvanic corrosion takes place when the materials start swapping electrons - this leaves the less noble material unbalanced and oxygen atoms step in and start to make new materials from it (oxidation!). If you can keep these two items electrically isolated (for instance, with a patch of fiberglass cloth and resin) or charged with a small current (as we did in some pipeline systems), they won't swap electrons as readily and it helps the less noble material keep it's molecular crap together. When they're in the process of corroding you can actually measure a tiny electrical current. This also explains why salt water accelerates the problem - there are other things involved but the salt water will carry electrical current better than fresh water so when you get salt water mixed between these materials, it accelerates the corrosion because it increases the electrical conductivity allowing the different materials to swap more electrons.