Divergeance point schmischmervence point. You of all people know similar events tend to take place in alternate timelines, even those that diverged long long ago.
Besides, my calling it a handwave implied suspending one's disbelief at the flaws in TNoTM's alternate reality idea.
Is it stated anywhere in concrete that the Typhon Pact was only concieved after the Borg invasion? Because expanding massively on an already planned small time trading alliance at least gives a little more believability to such a union spriging up in no time at all, complete with their own currency.