I am still a fan of a note that reads:
Safety wire indicated fasteners using item X (wire) IAW Spec ZZZZ
Then creating some simple spec like the one I linked above.
That way you don't need to sketch it everytime in a drawing or create assembly specific twisted wire models through fastener heads.
-Dustin
Professional Engineer
Certified SolidWorks Professional
Certified COSMOSWorks Designer Specialist
Certified SolidWorks Advanced Sheet Metal Specialist