Can you recall where you saw the info on the Haganah and Dutch East Indies? With a No.1 Mk.V turning up with the Viet Cong surely almost anything is possible!
Cut down Ross Mk.IIIs were used by the Veteran Guards at important facilities and PoW camps here in CanadaIIRC. There is a photo of a vet on the gate at REL with a cut down Mk.III.