@Danny75, well, I'm safe (or not as had it been simple i would have been sorely tempted) in the fact that i can't do the mod myself - definitely a redesign required from manufacturers - regardless of what he says about the Master - i wouldn't attempt that.
The concept is certainly feasible - but fear the costs involved will hinder the concept becoming a reality on the x570 i.e: logistics/packaging (the tall fin-stack would definitely have to be assembled by the user) and board redesign (moving 24 pin/capacitor, right angled headers etc - i am talking mainly about the Pro but concept is same for most Gigabyte boards. Asus was a bust...).
Personally, i like the idea - plus, i think Buildzoid has forgotten that the existing PCH heatsink could be given a larger surface area without the fan sunken into it. This would mean his fin-stack idea may not have to be quite as large as anticipated - especially near the end of his video where its size gets a bit over ambitious.
The fact that he mentioned Gigabyte had X570s boards without fans at Computex means it must have been a particular concern for board manufactures, on how well they would be received. And given the community rumblings around the fan and videos like this - hopefully that bodes well for the b550s, even if they do have minimal PCIe 4 capability.
*And someone send Buildzoid a Sketchup tutorial - that was painful to watch, even with my limited usage...