I'm not at all familiar with the company about which you're talking. However, I did peek inside a hangar at Norwood (OWD, near Boston) where there was a similarly configured Robbie. I was told that Altair Avionics (maker of HUMS and that sort of equipment) which is located on the field, had done the conversion and possibly were seeking an STC??
I recall noticing a horizontal bar that connected the central control point of the standard R22 to the base of the two sticks, just behind the calf of one's leg. It was kind of ugly and obtrusive, but for someone who wants the 'real' helicopter feel, this seemed to fit the bill. Of course, you'd then have to strap a turbine or two onto it, increase the MGW a few thousand pounds, redesign the rotor system, etc
