I am with the do it right crowd. since the holes are already there find a builder painter who can install bottle bosses. you'll have to repaint as pointed out but it gives you a chance to be creative. you could either just touch up the seattube or paint it to contrast the bike.
Personally I am not sure I like the whole rivenut idea.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk