Not an issue in this scenario
I will give you my opinion (based on knowledge and experience). I have spent over 40 years in the aircraft industry, most of it specializing in structures and corrosion control. The use of AD rivets and 300 series CRES steel will not yield galvanic problems in our application. If you want to take an extra measure, you can swab the holes with primer before installation. Also , the rivets are anodized which is a corrosion protection. Ironically, aluminum rivets installed in carbon graphite components is an aviation No-No, and will generate corrosion!