Well dude... once again it comes to this question... Why would you want to change something that Germans have worked on, designed and implemented for so many years? If there can be hundreds of Aircooled VW's in the world, running with the oil cooler in the stock position without it being problematic, even after so many years... So, why change it? I'd just leave that cooler where it is. Will definitely save you time & money.
You can't yet prove that this idea will solve overheating problems... I mean, in a computer, they don't position the heat sink for the CPU outside your PC case, just to get it "away" from all the hot parts. It is more trouble, so they rather just put it directly on the CPU, supply it with a constant flow of cool air, and it works 100%.
Also remember, by moving the oil cooler, you are definitely going to cause a few new problems for yourself while doing the conversion, with the first one being: Where would you move it, because currently it sits in the ideal spot...
cool air flows over it while the engine runs. Secondly, oil coolers tend to leak in the normal setup, so when you change the setup, you may just as well be busy creating a problem for yourself in terms of a leaking oil cooler setup.
I don't think the hot engine block affects the efficiency of the oil cooler that much, as it does receive cool air continuously. Like I said... leave it. Rather spend time & money on something else...
