You don’t want to put a turboprop on such a lovely plane. The radial is essentially more frontal armor for the airplane... If a turboprop takes damage I bet it just throws its blades and packs up.
As for the rest, you’re right. We need a 21st century Sky Raider with advanced electronics for all weather delivery of smart ordnance, a long loiter time, and a massive ordnance loads. Just image what sort heck a plane with four tons of Small Diameter Bombs could do...
If we can make cheap, so that there are lot of them, that would be even better.
I think that is main attraction of these Tucanos and AT-6s. Their load isn’t great, but they are (relatively( cheap so you can have lots of them and sell to third worlders, too..
If we ARE going for a turbo-prop COIN aircraft, though, we need to go with an updated OV-10 Bronco.
OV 10 is jake with me. Although I have always wanted to try the Argentine Pucará.