Batman gets killed within a second of the opening bell. K-gas or no gas.
I was about to say that Superman and Wonder Woman won't be able to hold off 3 kryptonians at once, but then I remembered that Faora and Namek still have their mask weakness.
Wonder Woman can generate some pretty decent energy attacks with her bracers and that might be enough to damage the masks. If not, I'm pretty sure her sword can get through it. So due to the mask weakness, I do think Faora and Namek can be taken out, now it's just Zod against Superman and WW.
If it wasn't for the mask weakness I see the 3 kryptonians taking it.