Let me explain why this would make sense for my situation.
I want to change to a compact primarily for my riding style. I ride in an area with relatively little climbing. I stay almost entirely in the 52 ring on my current bike. My "cruising" speed is 52/19 (72 gear inches).
i would never use the 30 ring on the trek 620 triple. A 48 ring with a 12/27 cassette falls right in the middle my "sweet" spot ("cruise" in 48x18 @ 70 gear inches) and I would not have to move to the lower 32 ring 90% of the time. Much less fuss. Would also get more "top" end with 48/12 (105 GI) than the 50/14 triple (94 GI). The Trek 620 will not be used for loaded touring - light stuff only.
Back to my original question. What currently available new off the shelf FD and RD would index with a 9sp Ultegra 6500 12/27 cassette using Dura Ace SL-7700 downtube shifters?