From what I know, Or at least what my laptop has done, You can accept the new EULA but not update GMS
EULA is more tied to your account, like your license and such...and legally gms, but you dont need the EULA for gms to work, it will install it, but you can select different runtimes/versions to run
My laptop is still a few versions behind my main pc and still works and makes games fine
As far as i know and can stand behind plausible deniability, this doesnt break the EULA, I even accepted it so, and technically speaking Not installing and using the beta ide is breaking the "ALWAYS UPDATE" rule and obviously thats not true
TL;DR Not a lawyer also:
I've not had problems Not updating GMS so far