i live/ride in a humid tropical country - every day is 35c+.
I ride an air cooled M696 - but the air just isn't cool enough.
Is it possible to retrofit an oil cooler to a M696?

Short answer, yes . . .

Here are some threads on the issue,  http://www.ducatimonsterforum.org/index.php?action=search2

 I had the 1100 oil cooler installed on my 696, it bolts rite up and sells as a kit.

http://www.ducatimonsterforum.org/index.php?topic=25434.0