you might have issues with changing the crank if it also requires also changing the bottom bracket. ie I changed to a carbon crank reguiring a hollow bottom bracket. I had one in but it was too wide for the bike and it would not fold. I had to get another BB and fit a spacer...or two. I recommend you get cranks that do not require a different BB.

Yes I think 135 bcd is campo road.

I found 1 cheapish 56 tooth chain ring on ebay ,has not arrived yet. I will give feedback when it does. ebay trader= " icyclesusa.com "