CASA's approval for an aircraft to conduct PSEA (the new ASETPA) is listed in the Type Acceptance Certificate.
https://www.casa.gov.au/search-centr...e-certificates
C208 certificates note approval for PSEA. PA46 doesn't. You'd be first of type trying to get it approved, which combined with the aforementioned abysmal performance as a commercial machine probably alludes to why someone else hasn't already done it, if it's even possible.