You still need the second inpingement, otherwise you might as well go with a direct die cooling approach, a la MaskedGeek (JFettig). It'll work, but nowhere near as well as you expect it.
I think that the o-ring, with the base drilled through would be best. You'll clamp down the IHS so it becomes flat, and make a near perfect joint. Of course you're still using a thermal paste, but the excess is just going to wash off.
The problem, if any, is getting rid of the nickel plating, without affecting the fine geometry of the IHS. Otherwise, it's still a prayer that the coolant isn't going to extract any more thermal paste.
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