With rc copters no less!
I have no campy experience, but would you consider looking into campy triple stuff? Im more of a touring pannier sort of guy, but still find my 50/39/30 changed to a 50/39/26 to be so versatile for lower gearing when the bike has panniers, and with a reasonably close 12-27 9 spd cassette, still not a bad low of about 25 gear inches (and with the long cage Rd, I can put a 32t cassette on for lower gearing for heavier panniers and stuff.)
I realize this gets into shifter changes and Rd and fd, and then I guess the other option is cyclocross and gravel doubles, but as mentioned, it brings into the game how much dough you want to throw at this.,.
Good luck finding options