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You do not need the driver side alternator to be an original isolated ground(it gets grounded with a short wire).
I think you already understand this from your posts.
I use an arbor press. If you use the appropriate diameter support and appropriate diameter item to press on the bearing, you can almost guarantee no damage to the case.
I think the key, even if using a hammer, would be using the appropriate diameter support and punch(diameter).
You do realize, you could have used the new alternator as it was(without converting it) in the Alt 1 location(only).
Only alt2 needs to be isolated ground.