How to modify a client's actor for just that client?

What I ended up doing was making 2 child card classes, one with bOwnerNoSee set to true and one with bOnlyOwnerSee set to true on the UStaticMeshComponent. This makes it easy to separate the behavior of clients’ cards from cards that should be visible to everyone. I also set the client card class to have bOnlyRelevantToOwner = true.