Folks,
In this wonderful argument about your ABCs, you seem to have missed the point of why have a category set of speeds.
"Tis all about the obstacle clearance envelope and the minima for a class --- with different minima (usually) for each category ---- excluding low weather minima operations, which shouldn't worry you too much in Australia, as any Cat11/111 ILS installations are very thin on the ground.
If you want to fly an approach speed for a higher cat., just use the higher minima, if applicable. If you can't maintain all the higher speeds, the only thing that will happen is you will hold up other aircraft, hill abatement will not be the problem.
If you are really keen, settle down one evening with ICAO Doc. 8168, it's all in there.
With regulatory approval, you can reduce a category, which means flying the lower speeds for the lower category. A number of operators have this approval for YBCS, so they can get a lower minima.
Tootle pip