Replacement heatsink for 'desktop mode' (Coolermaster Case or other)

Looking at this image, it seems that if a small heatsink could be made to fit this hole, it would provide much better cooling and airflow in the coolermaster case (esp in vertical mode)

Has anyone already made any mods in this vein? any ideas on if it would even be a good idea (the 13th gen i7 runs loud!), so looking for tips to quieten it.