The methods of earlier deployment would be:
AW Jerome
CR Yuyu
AW Olivie
AW Yuyu

Out of those, it sounds like the only available option would be the AW Yuyu, though again I'd hold off on trying War of Magic with boosts (or at all) until event time where you can benefit from the boosts for more than just the one map, or just wait a few months by which point you may have AW Yuyu without having to prioritize her over other units that may be more critical to maps besides this one.