I recommend you order a big aluminium heatsink from China cut it into shape [hacksaw works well enaugh] and lay a bead of Arctic MX-6 across the VRM bank also adding some high temp silicone adhesive to the corners to keep the heatsink from moving is an excellent idea that I got recently from someone here!
You could make custom holes to the custom heatsink that corrospond to your stock MB heatsink but since my friend's MB doesn't have such mounting holes we were forced to use High temp silicone adhesive to keep it in place!
BTW we saw a 29°C difference, and the choppiness that he was feeling before while doing heavy gaming simply vanished!
This is the product that we used and apparently such extruded heatsinks are designed for industrial applications such as rectifier cooling etc long story short we got 1meter of heatsink and it was the best 25€ ever spent!
We had a lot of fun while doing this mod and I'm sure many people out there will also experience the joy of modding stuff.
Anyhow this thread was a joyride for sure!
Thank you to everyone who participated!