That's just it, it doesn't really matter. Your only chance is our sphere breaking up. You won't win with the current set up. You had no chance starting this war either. Must've been aware of that.
So the smarter move is to try to stay out of wars, build and see and hope the sphere breaks up. As I said, might happen, might not, but you're not even close to achieving what you want to achieve now. So either keep engaging us in war, making it impossible for the sphere to split, or just gamble and see if it happens. If the gamble doesn't work out, you'd find yourself in a war you can't win... kinda like now. Nothing gained, nothing lost. So there's really just two options here, one absolutely hopeless, one with some hope in it, however big you think that is.