This law doesn't seem to apply where I live. There is a CBi at $650 an hour (£413) near my airport.
I'm near afraid to ask what the R44 costs. These are all Piston figures. Turbines would be out of the Question full stop.
However, me and me Da in a "C" and I didn't have to do any sums. If I'd taken him flying in a CBi, I would have had to have done some fuel and W&B checks.
You will be sticking with the "C" Model then
Dave