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@Oswald
What BMMF said .. You really don't need anything special. i'm using a Red on one bike and Dura Ace on another bike both with 48. If you haven't already tried it .. do so! I'm assuming you'll have moved the mech lower on the seat tube so that the cage is spaced the correct distance from the outer ring and adjusted your cabling to suit.
As for the CX 70 mech .. It will work with your down tube shifters as your front shift, if I remember correctly from running them shifters myself in the past, will be a friction shift? Just make sure if you go that route you get the correct pull for your bike.