The thread below had a good discussion about the relative merits of the Flatland Vs Force radiator guards.
http://www.everydayriding.org/2009/08/wr250r-force-accessories-radiator-guard.html
The key point I got out of it was that the main risk to the radiator is side force from a low speed tip over which could bend or crush the radiator. This side force is generally transferred from the plastic body to the radiator.
In another theread someone suggested replacing the 2 outer radiatior bolts with zip ties to allow the plastic to move without bending the radiatior.
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I had the following idea that I'll throw out for your comments?
Make braces that go from each the outer radiator bolts across the front of the radiator then make a 90 degree bend and has another hole for the inner radiator bolt to go through. It seem that this would avoid ANY transfer of force from the plastic to the radiator (as it would all go through the brace). This could be done for almost $0.
Even more protection cold be added by putting a verticle metal brace between the 2 outer radiator bolts and then another brace angled in from the lower radiator bolt to the frame or the skid plate.
I'd probably make these braces out of aluminum angle stock available at Home Depot, etc.
Comments Solicited.