Imbalance would be very minimal, probably absolutely un-noticeable. If you are really extra anal-retentive then you can get them balanced. If you drill the holes the right size the studs will just press in like normal, you only have to weld them if you screw up or just plain don't know what you are doing. As far as safety goes they should be 100% fine. I don't see any reason why the hub would break just from a few extra holes. Search for the DIY thread, this exact procedure is outlined in there.
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