The Skyhawks will not fly again, in practical terms they are beyond economical repair.
The Macchis would be used as an advanced pilot training aircraft. (As they always were anyway, prior to 1999 all RNZAF pilots regardless of final aircraft type, did fast jet training - it teaches them to deal with a higher workload and makes them quicker at dealing with things). They would lead into the A109 - NH90 / SH2G and Herc / Orion.
Currently the Beech King airs are doing this role, but not very well for the helicopters pilots. (Obviously the King air is being used as multi engine conversion, which would still be needed).