That might work if:
1. They were close enough to the right diameter that you could safely overbore them to fit.
2. The resulting compression ratio is between 7.5:1 and 9:1.
3. You could find a rod that fits both the piston and your crank.
4. The new pistons aren't too long, resulting in a rod that is simply too short to hold up. (generally diesel pistons are much longer than gas pistons)
Why do that when stock turbo pistons are cheap and hold up to 400 HP just fine? After that, aftermarket pistons are available that will hold more horsepower than it would take to bend the crank or blow the head of the block?