I have no idea why the mediator would recommend S rather than D, but can you just use your maiden name-married name in combination? That's what I do. I'm starting to experiment with using my maiden name exclusively for my business.
M 16 yrs, WH62, P54 3 adult blended kids EA 11/13, BD1 6/14 PA fall 14, BD2 2/15 Piecing 2015, BD3 12/15 Separated 4/16 WH moved OW in 5/16 Divorced 6/15/17