>Weimar Germany collapsed due to the terms of Treaty of Versailles which essentially broke Germany's economy (Germany was essentially already in a depression well before the US).

This is completely wrong. Weimar Germany endured significant troubles in the early years due to political instability and reparations, but managed to overcome them with American loans and rewrite some terms for a decade or so of "Golden Years" before the Wall Street Crash, in which loans were withdrawn and the unemployment then rapidly rose.

So while the Treaty played a role, the Great Depression is the direct cause for Weimar Germany's eventual collapse. If they had 10 more years to recover, or if certain political moves were done differently, Fascism likely could have avoided.