There is no way to balance the game and have Italy be able to swing.
Sure there is. You just need to have the side it ends up on be determined by an investment of IPC, and whoever loses gets their IPC “invested” back.
Conceptually this would be along the lines of making promises to Italy and then if they don’t have Italy on their side, they don’t have to fulfill the promises.
Another way to do it would be to tie Italy’s entry as CP to preposterous, unlikely success against France, which would also be tied to an even earlier US entry.
Obviously it’s not easy, but to say their is “no way” is exaggerating just a bit too much.
How about no way to make the game historical and balance with an Italy that swings.
If we assume that thereis no way that Italy would have joined the CP, then I would agree with you.
Which is what we do looking at the political scene in Italy in 1915.