use Windows registry in wine
Wine emulates the registry so this might be more about putty being amenable to this alternate SDK. 


https://wiki.winehq.org/Regedit
https://wiki.winehq.org/Winelib


wine regedit

If the second link saying putty is ported is wrong, hopefully you don’t have to dump the registry and translate them to a terminal setup. ssh (as are the other tools) is native on macOS, so functionally you could ditch putty. You’d lose the graphical accordances and specific shortcuts and settings portability of course, which is what I’m guessing you want to avoid reimplementing.