Keep in mind you don't need a SS/fixed specific crank for an SS bike.
On my On-One Il Pompino (120mm rear spacing with Surly New Hub with ~42mm chainline) I run a Bontrager Race Light GXP (road double). With that crank I use the inner position for the chainring with either a bash guard (summer) or short stack bolts (winter, for easier cleaning) . The Bontrager cranks are rebadged Truvativ. From the
Truvativ GXP manual (lists cranks chainlines) the chainline for the road doubles are listed at 44.5. For doubles this is measured between the rings. With a 5.0 mm chainring spacing this puts the chainline for the inner ring at ~42.0mm, go team.
I guess my point is there are plenty of options for SS/fixed bikes.