I'd move the oil cooler to the driver's side rear fender well. Hoses are cheap.
A DTM is $575, plus freight (which will be at least $100). A welded/balanced wide fan is $110, and a 356 pulley will be $100 as well. It gets really, really spendy out in the deep water.
Do all that, and you'll end up moving the oil cooler anyhow. A DTM, etc. is good for cooling your heads. The only thing a DTM has that any other shroud does not is a T4 oil cooler on the stand, and you can do that with any tin with a bit of modification.
Just move the cooler.