Harry mate,
not so sure you are correct regarding the limitations of a C550.
An ops analysis.
C550... operating weight....8300 Lbs
inc 2 pilots @ 200 Ibs each
Patient
Doctor
Paramedic.........................700 Lbs
Zero Fuel weight..............9000 Lbs
Max Fuel.........................5000 Lbs
Take-Off weight............14,000 Lbs... Max is 14,300 Lbs
Flight time Barrow Perth 2Hours 10 Min... Burn off 2400 Lbs
That leaves 2,600 Lbs at Perth to play with, a lot of options there.
Kal..Meeka...Geralton...2 hours holding.