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The reason you want the oil cooler. . .is because the oil isn't actually cooled by anything. It flows next to the jacket but most of the heat exchange is between the cylinder itself and the coolant.
The hot oil acts like a giant thermos trapping heat against the block.
If you drop the temperature of the oil to lower than the temperature of the block you acquire some cooling effect of the oil.
The radiator is already dissipating a substantial amount of heat with virtually no air circulation just because ambient air is about 40 degrees C on a really hot day and the coolant is 100. Improving the coolants specs are small gains because the coolant at best will get down to 40 degrees c before being recirculated.
The oil that is heat soaking your block and all of its parts comes out into the oil pan, sits at 100+ c and then goes back into the engine with virtually no heat exchange with the incoming air.
You might be able to get your coolant down from 80C to 60C with a second radiator. . .but you can drop your oil temps from 2-300 to 100 with an oil cooler. So for the virtually the same effort you get a 200 degree temp drop or a 20 degree temp drop. Anything thats less than 400C is going to cool the block some and 100 degree c oil and 300 degrees is a big difference.
You don't neccessarily need to mount the oil radiator out in front or create frontal area with it. Alot of tuners put their charge cooler along the bottom of the engine bay just behind the radiator. Its just up inside the engine bay so it gets some exposure to the turbulent air under your car, but it doesn't create substantial drag.
It's likely it would also slightly increase AITs because any air that comes up through the bottom of the engine bay is going to be slightly preheated. . .
The point here is not worrying that the components are going to degrade the oil itself. . .but using the extra contact area of the oil/engine as additional heat sink instead of trying to squeeze more chilling out of your already pressed coolant surface area because thats the actual problem. The coolant only has so much engine contact to absorb heat and can only absorb so much before it boils. Oil has tons of contact space and can survive much higher temps for longer exposure.
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