External oil cooler with Porsche style shroud

[70Turbobug]

I am very aware that it is a general consensus that the stock VW fan shroud is better than most Porsche style shrouds.

Hi Onixbonilla, who told you that? If the stock cooling system works better than a 911 type system than the shroud being used is the problem.There are a lot of copies out there and many of them just plain suck and are for looks only,especially for type 1.With a proper shroud like Remmele,GWD,MSS for type 1 they will all outperform any type 1 cooling system on the market,including the DTM.
CSP has adapters for both of your possibilities.For type 1 I would go the full flow route.