If you did nickel plate them, and a customer asked about corrosion, then you could say any copper in the system must decay until it falls off before the cap loses its shine. Nickel, paired with copper, eats.
You are right anodising will pretty well stop reaction with copper. And how often do we see any computer components older than a decade anyway?
As I said before, any doubts about adding aluminum to a copper system you may answer with the good news that your aluminum plug actually helps protect any copper it electrically connects with.
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