What I would do to cool the CPU VCORE supply(ies) is to mount a water cooled
plate on the backside of the motherboard. It's stealthy and will work nearly as well
as trying to make contact with all the devices and their various component heights.
The board maker puts a whole lot of copper in the power supply area to help dissipate
the heat from the FETs , inductors and caps. The back side of the board usually has few if
any components so you can make good contact over a large area. You might have to use a
conformal pad if there are some small surface mount caps there. Also will have to grind
down any protruding leads from inductors or electrolytics. But you only have to take out
10-20W over a 4 square inch area, so it's not like mounting to a bare CPU die as far as heat
transfer efficiency goes.
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