Sorry for the Delay.
Well, maybe this vote for the creation of a Grand Army of the Rpublic could be changed to a vote whether more Clones should be acquired or not (like in this Clone Wars episode about bank deregulation).
As you mentioned parts of the plot focussing on Obi-Wan would not fit anymore, but I think the main structur could remain.
Currently I am more worried about how to integrate the creation of the army into episode 1, idealy together with the Separatist and Count Dooku.
For this purpose I took the sceen with the Senetors in Palpatines office listening to Obi-Wans discoveries on Geonosis and “replaced“ Obi with the hologramm of Sio Bibble, telling them about the invasion (showing that they were thinking about an army at this time).
In Episode 2 this sceen wouldn‘t be needed anyway, because the army already exist (no need to persuade Jar Jar to give a Speech in the Senate) and a simple call between Anakin and maybe Windu would be enough to inform them about the droid army.
Back to episode 1: Maybe Palpatine could promise an army, if he gets elected?
Anyways thanks for linking these Threads RogueLeader and oojason.