I am pretty sure that Australian naval aircrew operated the fairey firefly on HMAS Melbourne and Sydney during the Korean war in independent RAN squadrons.
HMAS Sydney III had 816 and 817 Squadrons operating 50 of the AS.5/AS.6 variant. Although I believe this is already in the tree.
Heres some photos of them operating from HMAS Sydney from the sea power website:
https://seapower.navy.gov.au/history/units/fairey-firefly-as5as6
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As @Ogaly_Bogaly has pointed out, I have already got a Firefly in the tech tree. The Article XV squadron aircraft were others, like the Hurricane, or the Gladiator.