Had some Ideas and up front I would like to apologize for the crudness of the diagrams
I am currently looking into the cost effectivness of building to suit a water cooling system but had an idea
You started talking about ambite air and got to thinking on how to coll the air with out using your airconditioner and/ or moving your desk. I thought of this.
This is the "Slant-Fin "Personal Space" Air Cooler KZ12"
It lasts for about 10 hours on regular tap water. and cools the air
Here is the idea
Make a plastic airduct to hold a 80mm fan that you would normaly use for a radiator an hook all of it up like the diagram. I thought about pulling air and pushing air. neither should be a factor becuase you should have enough air puch for your radiator its a matter of the air your pushing. that were the duct comes in. the duct should have air outlets on each side so air that is coming from the KZ12 unit can escape but closed enough so that the air inside the duct is cold. In thory, there should only be a very little bit of air escaping from the vents, this will alow the air inside to be cold and not enough back pressure to over load the KZ12 unit.
So What do ya think?