Hi,
I prefer, have bought and still use the AIRBORNE SYSTEMS LTD Belt Dispatcher MRIIGQ2036 which is the standard military flight dispatcher's harness ('Monkey Harness') for all filming work as it keeps the cameraman properly restrained by a proper aviation-standard harness belt with good restraint, adjustable reach (adjust it before flight so that he/she can't fall out of the helicopter doorway!) and quick release buckle with double tabs. This is the standard military helicopter crewman's harness in many countries. Cost when I last ordered some in 2010 was GBP 1060 without shipping. If you contact me direct I can send you info and also an SOP for its installation, adjustment and use (based on Bell 202/212/412 use). see
www.airborne-sys.com website. You would have to check your local CAA/CASA for approvals for your own local use.
Cheers,
O