How bout Xavier going into cerebro and wiping out the zombie virus mentally? Couldn't he have every zombie not liking flesh and instead preffering the taste of chocolate? Lots and lots of chocolate . .
And I firmly believe that Hulk's blood would overpower the virus, eventually. Hell maybe Hulk might even be a zombie for a couple days, but eventually, gamma blood wins. It's wipes out AIDS and all the other dangerous diseases in like seconds. There's no way Hulk stays a zombie for long.
The zombies would be toast if 616 Galactus went to Earth. I was reading up on his abilities and the zombies are so dead it's not even funny. Not only could they not "eat" him but it would take a lot more than what they did to even defeat him. The best they could hope for it he makes some kind of deal with them and leaves them alone for a while. (like what usually happens)
And of course there's always the reality-bending retcon people who could blink and change all the zombies to pink stuffed animals. Galactus himself has risen entire planets from the dead, restoring them to their original populated state.