My new end cap has aluminum rivets with a copper colored coating, it rubs off but the wife liked the look so it's a keeper I guess.
I personally would not worry about mixing aluminum and copper in an interior dry condition. Zink Galv. and copper is not a good mix but pretty sure it takes moisture to create electrolysis.
Google found this:
. Aluminum will be very susceptible to galvanic corrosion in contact with copper, assuming that the two metals are also in contact with a common electrolyte (such as water with some ionic content.) Almost any text or handbook on corrosion will have galvanic series table.
Good judgment comes from experience, and a lot of that comes from bad judgment.