I know it would sound dumb, but what is the point of not using a pump ? it makes less noise than a 3 quite fans.
An MCP-655 set to speed=3 is inaudible and makes almost 0 vibrations.
For me it seems that using a passive rad will give better, am I wrong ?

other than that, I like that Idea Tony, I'm just not sure about it's benefit over passive rad with a quite pump.