What does your OpSpecs say.....that would be the first hurdle to get over then you might try to fall back on the information you suggest.
But.....this is what the Regulation states:
Code of Federal Regulations
Sec. 135.207
Sec. 135.207
Part 135 OPERATING REQUIREMENTS: COMMUTER AND ON-DEMAND OPERATIONS AND RULES GOVERNING PERSONS ON BOARD SUCH AIRCRAFT
Subpart D--VFR/IFR Operating Limitations and Weather Requirements
Sec. 135.207
VFR: Helicopter surface reference requirements.
No person may operate a helicopter under VFR unless that person has visual surface reference or, at night, visual surface light reference, sufficient to safely control the helicopter.