If CASA were to legislate that light jets have to go under a CAR 217 program then so will the Cheyenne IV and the Piaggio Avanti as they both fly single pilot as high and fast as any light jet. And if those turboprops are in then so are every similar class turboprop. Just make all IFR charter companies operate under a 217 program.
In reality how many 'small charter operators' are going to have the funds and resources to operate a small jet anyway?
F111's post shows where the real heart of the problem lies, CASA are not consistent in their application of the law. West Coast FOI's say one thing East Coast FOI's say another.