guess as an ETOPS flight, for shure a no go with APU inop. Well done lady Cpt.
And concerning Airbus MEL, it will allow you to fly the beast at anytime. Well almost anytime, maybe if one wing is missing or so
NO DISPATCH is very, very rare in Airbus MEL.
So a good Captains decision is always needed to go or not to go.
TWO (heavy) electrical issues is one too much in this case and on this flight. IMHO.