Maybe cylinder fan spot cooling over oil cooler
Below are three different fan systems
the video demo's show big V-Twin idling for days using the fans to keep them cool.
maybe they could be attached on the backside of the motor - out of sight?
Love Jugs air fans - the bigger fan option
Maybe fitted on the backside of the cylinders (jugs)
https://m.youtube.com/watch?v=bUt1ILH6t2Ahttps://m.youtube.com/watch?v=Wencsm0VGa0Fix My Hog free channel - newer smaller model "Cool Master"
https://m.youtube.com/watch?v=3DtWoGcfibohttps://m.youtube.com/watch?v=Lw3XXq__gSUAnother smaller twin fan setup which looks nicer
http://wardspartswerks.com/cooling-fans.htmlhttps://m.youtube.com/watch?v=tAmaGOromiYSingle cylinder fan
https://m.youtube.com/watch?v=BjRCBPygFnA