1 idea was creating a shelf for the existing desk contents to free some space.  In place of the stuff, 2 blowers go behind the monitor & feed 2 adjustable vents behind the keyboard.  A proof of concept could involve cardboard ducts, 3D printing just the vents, & the still unused Nidec blowers.  The problem is moving the vents when it's time to feed the mane.

The leading idea is now a Tesla style vent attached to the monitor.  The blower would possibly also be attached to the monitor.