At that point you may stay, leave or fly for any other operator - provided that you only fly multi-crew and only on a type on which you are endorsed
Checkboard,
Are you absolutely certain of that statement, if so, could you please provide a reference.
If that is what CASA is doing/allowing, it is contrary to ICAO Annex 1, and the original intent of the MPL, that it was not transferable.
I would also be very careful about whether "doing a BFR" is all you need to go fly lighties --- unless you already have a PPL. You cannot fly as pilot in command on an MPL --- unless CASA has done something weird here, as well.
Finally, 6 is not representative of the amount of MPL training in AU, as most of it is being done by/for overseas airlines.