The Group Policy Editor is just a pretty face for making registry changes without actually using the registry editor.
Someone at some point will undoubtedly post the corresponding registry key(s) and their appropriate settings, to effect the same change.
I for one am not sure that it is
A. A good idea
AND
B. If it will even work in the long term
I believe that MS has suggested that deferring updates, is only possible for so long, 30 days or something similar. After which, I'm not sure what exactly happens.
Maybe, either you get them, whether you want them or not, or you get no further updates until such times as to catch up..... IDK.