For those mosfets: you could de-solder them all from the mobo, together with their heatsinks. Then proceed like BladeRunner did for his PSU.
If a mosfet backplate wasnt connected to GND but to some voltage, put a wire between the backplate and the original heatsink hole.
Just make sure U put some mica/ceramic shims between mosfets and the waterbloc... and all will be allright.
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