Given that "adapted" aircraft almost always involve too many compromises and lose sight of the core mission requirements I tend to thing that an all-new design would be a better bet. I do wonder if a variation on the SABA (P1233/5) concept would make a good COIN platform.
Being a blank sheet of paper design it would need fewer compromises, but the raw performance (size and weight of a Sea Fury but with more than double the power) should give it good short-field characteristics, the large number of weapon stations should allow a flexible mission load and the fuselage configuration is just screaming out for a mixed cannon/minigun installation under he cockpit floor.
€0.00006 supplied,
PDR