So, the shortcut for G4 is also to set up a new organization with G4 vetos,then replace UN with the new one.
In fact, USA just did so with Leagues of Nation,by setting up UN .
of course, the precondition of such effort is that G4 would be powerful enough to attract more followers than P5.
otherwise, even if G4 were allowed to own Vetos of UNSC,USA,CHina ,Russia and EU might set up a new organization with only 4 vetos( USA, Russia,CHina and EU),which would naturely take over most power and influence of UN and disable UNSC.
At that time, G4,including India, would find it were just a waste of energy and money to get such valueless vetos of UN...haha.