I don't think the revivals are designed with the intent of even veterans being able to MLB weapons and eidolon from both events simultaneously. But if you have a massive stock of AP potions (~200) and are farming Ultimate, it's probably possible. Ultimate wins result in a net gain in AP potions, so you'll eventually get them back by trading for your 2 potions a day.
But for most veterans, they'll be halfway to MLB on each weapon and eidolon to start with, so it'll be no more effort than a usual single event.