I seem to remember T 28s were also flown (by Cuban pilots) in combat against Simba rebels in the Congo in the early sixties.

Not just Cubans. Also flown by (Tschombe hired) South African, British, and Belgian pilots. Several of these planes were exported to the US in the late 70s. One is under rebuild in Belgium, and another is displayed (fuselage) in the UK.

T J