What he said.

I think there's a huge flaw in your foundational thinking about this. I don't care how svelte your steed is, once you add on the panniers, rack, gear, etc. etc., you're by definition klunky. ANY BIKE, not just your Milano, is going to be "too heavy and klunky." Further, the amount of marginal additional klunk from starting with your Milano vs. e.g. a Trek Madone or Pinarello Prince is going to be neglible.

I'm all for NOT tarting up the Roger with klunk and I think you have a great path to go down and you're asking the right questions if you want to build yourself a purpose built slick commuter. Go for it. But do it on THAT premise, not the flawed assumption you're jumping in with.