This basically comments out the part of the script that executes the Ravenous Hunger effect, leaving everything else intact.
Copy HC_ManagerScript.pex to ...\Fallout4\Data\Scripts\Hardcore\

in \Documents\My Games\Fallout4\Fallout4.ini
make sure to have:

[Archive]
bInvalidateOlderFiles=1
sResourceDataDirsFinal=