I just don’t think there is any crank arm or spider based version compatible with that crank.
I checked 4iiii, Stages, Power2Max, Rotor and couldn’t find any for the Omega. There are a few for the upper end FSA, but nothing for that one. I didn’t check SRM, but doubt they have one for a that crank.
The only options I’ve seen for you are pedal or PowerTap hub/wheel build with the old G3 disc.