This may sound a bit strange, but to help mitigate the potential corrosion between the two dissimilar metals, before using the rivet you can pierce a small piece of electrical or other tape as a small buffer between the rivet head and the Al sheet you are riveting. Afterwords if any tape is showing around the edges of the rivet, you can carefully trim away using an X-Acto knife.
This will provide you the strength of the steel rivet, while keeping any contact corrosion at bay.
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