>>2325112True, the war would likely begin due to another cause. The most likely culprit is economic. Also, without a nuclear attack, N-Jammers would never have been deployed.
Now the 3 blocks pre-CB have a technology level fairly compatable with CE's pre-show technology. For the sake of argument, we should go with CE physics and assume that GN particles are unnecessary for beam weaponry.
Given that the Earth is traditionally the side that miniaturizes beam weaponry for MS use, it would be safe to assume that happens here. The problem is that I don't believe the solar powered MS, which really are running off of batteries like CE MS, have the output to power them. Flags and Enacts are too skinny to effectively carry a reactor, so they'd likely just get beam saber refits, since those take less power. HRL, however, has the bulkier Tieren, which would get a reactor upgrade. ZAFT would counter with nuclear powered Gundams. I'm loathe to even include Gundams in this, but it's the only counter ZAFT would have to prevent being zerg rushed. Being a Gundam setting, ZAFT would end up the victor because they're the ones with the Gundams. Still, their victory likely wouldn't change a whole lot besides starting a cold war.
Oh, and Graham would beat the piss out of Rau. Sergei could beat him too, and let's not even get into what Ali would do to him. Guro wouldn't begin to describe it.