I do have to admit though that when i had it set up on a 10s triple I didn't like. Your extra cog is probably going to be around the 18t cog and most riders really don't notice it.
I notice a missing 18 a lot, especially on a compact crank where the 34 is too small to be useful on flat terrain without a head wind and I'm staying on the big ring.
I think it's much more important than having a 12 cog.
And campy really only has one triple ratio of 30/42/52
1. Campagnolo also sells 50-40-30 triple cranks
2. The inner position has a standard 74mm circle, so you're free to swap on a 28 or something even smaller (might need a chain catcher to shift well)
3. TA sells 135mm first and second position rings if you want something stranger with Campagnolo crank arms (while not quite as elegant as the 2-ring versions, the Record triple crank is probably the best looking 3-position crank ever made).
4. Campagnolo derailleurs work as well as the pins and shift ramps allow them to on non-Campagnolo cranksets (Campagnolo and Shimano do a better job than companies like FSA)
Do you really need the top that the triple provides? Have you thought about a super compact double, say a 30/46 with the 10s rear?
I don't need any more than 52-42 x 14-16-18-21-24-28 but I really like having closer gears with the same range.
Living in Boulder, CO with mountains west and plains east I ran 50-40-30 x 13-14-15-16-17-18-19-21 in the 8 speed era, added a 23 cog on the end when Campagnolo discontinued that, and made the mistake of switching to a 50-34 up front when I wore out the chain rings since 34x23 was the same low gear as 30x21 and I bought into the story that two rings are better than three.
50x21 at a pleasant cadence only reaches down to about 15 MPH, while 50x14 only nets about 17 MPH. So there are fatigue/wind/terrain combinations where the compact double means I'm doing a lot of shifting between the two ends of the cassette which takes two right shifter wiggles to get from 34x14 to 50x19.
That didn't happen with the triple - 40x21 will go below 12 MPH and above 20 MPH at cruising cadences so it covers those situations. Where the 40's not enough it's only a three cog move (one right shift) up to the next gear on the 50 ring.
The triple shifted better too, but I'd guess that's as much a difference in the inferior pins + ramps on the FSA compact chain rings than the 16 vs 10 tooth jump.
If I really needed it, the triple can be setup for much lower bail-out gears than a double of any sort.
A 12 or 26 cog with the move to 10 speeds and a compact double would help a little but still have the same shifting behavior and low gear limits.