Actually you may get lucky. I got 744ER "Wunala" (OEJ) on Feb 11th for this very flight QF
108, and have also seen OEH operate that service couple days earlier. It originates in JFK
. Usually, I see one of the "ugly sisters" (OEB,C,D) operating this service more often than others but you never know.
The only way you can guarantee an ER
is QF93/94 MEL
but you probably knew that.
Anyway, even for the insiders March 18th is still very early to tell. I suggest you try 2-3 days before your flight.