You'd be better off using Gilgamesh than Siegfried with your plan, but the biggest problem with your plan is that your mixed element team is going to be weak as heck to the point you won't be able to phase push any better than if you had no rage gauge reduction skill but elemental advantage and damage.
Regardless, this is less of an anti-overdrive team than it is simply a team that can push rage phase. You're going to be eating tons of overdrives from regular phases.
Even less reason to do it with union events since you can push phases with a single skill in union events and the fact your damage output will be compete garbage leaving you with awful PP gain and most likely never MVPing.