I've been looking into the exact same thing for a build I'm doing. I've been looking at narrow wide. Garbaruk do an S works specific one and so do Wolftooth I think. I also read a thread suggesting a guy got a regular SRAM GXP direct mount chainring to fit.
out of interest do those Sworks crank use the same spline pattern for the spiders as the hollowgrams? could they be interchanged?