Building the A-1 Skyraider would be difficult as I don’t think anybody builts a supercharged radial aircraft engine any longer. A radial is a good engine from the standpoint of withstanding battle damage. Jet engines (and essentially that is what a turboprop is) are delicate things. Not an engine type I would want to take on a straffing/rocket run if I had any choice.
Really IMHO not a bad idea, especially with turbo prop late model engine.
Boeing pitched an updated Bronco, but remember the Air Force called for a ready to use aircraft.