Hi BobSVX96,
thanks for the explanation, I now understand what you mean about the 3 outlets.
I've got a spare water pump I am planning to install soon. This one is a 2 outlet pump, but it looks like the casting would support another outlet, opposite side to the 2 outlets. I am guesting it is possible to drill the hole and press a connector sleeve (not sure the term for them) into the hole for connecting up another hose.
I took a picture:
https://photos.app.goo.gl/P46PPyCTu9H6FRYw8
The place the fitting would be installed is in the upper left.
I took a picture of the outlet fittings for reference:
https://photos.app.goo.gl/faemdn3WtrbHVZ878
Note the fittings are different sizes. One appears to be 5/8" and the other 1/2".
I am not sure which fitting you would need for your oil cooler, but I do see fittings available, for example:
https://www.summitracing.com/parts/fss-84716
I would image most small machine shop could perform the modification, or you would do it at home if you have drill press and a press. Although looking at my pump, it was either dropped or they put the smaller fitting in using a hammer.