It`s already been done in a graphic novel!Apokolips turns out to be a dead world that G can`t use.He briefley fights DarkSied,gets hit with the omega beams,tanks them them almost one shots DarkSeid.G leaves he is not interested in dead planets!this from like 15-20 years ago.Learn your comic history!
Galactus can be beaten, but he should win this. I guess. The whole "starving" or "fully fed" Galactus thing is kinda stuuid IMO.
Can they defeat Galactus in an outright battle? Hell no. Could they deter him from apokolips or make the fight not worth it? Definitely, I mean Galactus has been deterred from Earth like ten times at the least.
The giant cannon that cut into the source wall should do the trick.
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Never let anyone else define you. Don't be a jerk just to be a jerk, but if you are expressing your true inner feelings and beliefs, or at least trying to express that inner child, and everyone gets pissed off about it, never NEVER apologize for it. Let them think what they want, let them define you in their narrow little minds while they suppress every last piece of them just to keep a friend that never liked them for themselves in the first place.
Galactus does not have showings which show that he can take Apokolips in a fed state much less in a starving state.
Hell, Apokolips have weapons which captured Ares with entire Godwave.
While pre-Crisis new gods had some pretty cool moments (they also had cosmic cartridges which made them one with the universe) saying that random New Gods could generate that amount of power is misleading. They aren't anywhere near that level. Even high level ones like Orion and Lightray weren't anywhere close.
Fiddler once mindraped the entire New Gods population (pre-Crisis). Fiddler, who's vibrational music got resisted by Jay (who himself got constantly beaten by random thugs) back in the golden age and gets owned by him quite often.