CIR or PIFR can be done on whatever aircraft you want - only limitation is that if said rating is not ME, then the IFR privileges (command = commercial) are limited to SE IFR Ops.
I had a SE PIFR done in a PA28, including IF departures, holds on VOR/NDB, VOR, DME & NDB approaches.
Talk to Rick Wedgewood at Avalon Air Caboolture; he knows more about the PIFR than CASA does.