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Nope, that's pretty much the way to do it.
Usually I use method 1. However if I've modeled a repeating element that's really easy to move back into place, when it comes to unwrapping I'll delete all but one instance of the object, unwrap that then duplicate it back into place.
I'm not sure how XSI does it, but in modo if you copy UVs from one piece, you can select all of the others at once and paste the UVs onto them. Might be worth checking if that works in XSI - it makes things a lot easier.
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