I know a guy at a major ozzie airline who is an AME.
he actually has a CASA licence on the -800.
But despite the fact 737-800 guys are always being brought in on overtime the clowns at this major airline wont pay this guy as a LAME.
He spends his own money and holidays on an external course, gets the ticket does essentially a lot of LAME work (bar the actual sign off) but gets shafted by his employer who somehow thinks they are saving money by paying double dollars on higher paid guys.
Idiots.
It is not a one off case either.
Anyway, that will give you some idea of your chances.This guy is in his forties with a lot of OS experience not a newb to aviation.