I think Monel rivets are almost as strong as SS but I too have heard that they go better with aluminium.

The yellow stuff for putting between SS and aluminium to slow the corrision is Duralac. I've heard it's highly toxic, but it does the job.

For low-load items aluminium rivets are ok and will not create the corrosion problem, so I tend to use a mix of aluminium and Monel.