You’re talking about a 7000 ton ship with a quoted purchase price of around $A200. It might be a useful ship, but it is not an ECC replacement. It might have been a good choice as an Arafura substitute, but it was not available when the decision to acquire those was taken. (And, to be fair, the growing significance of drones was probably under estimated.). If you want to use it as an MFU, it would need some armament - indeed, even if only for a research and surveillance asset it should have some.
