Umamusume backup email recovery delay fix?

With the massive limited-time crossover event starting tomorrow, I tried to log into my old Umamusume account, but I realized the backup email tied to my profile was completely deactivated by my provider. I submitted a recovery ticket, but support says it will take days to manually verify my ownership and update my login credentials. In the meantime, I’m stuck on a temporary guest profile and desperately want to secure the pre-event milestone bundles before they disappear from the store tonight. Is there a safe way to purchase these packs onto my temporary profile using just its current Trainer ID without losing the items when support finally merges my main account?

On the eve of a major update or crossover event, a stressful situation may arise if you suddenly find yourself unable to access the in-game store due to account-related or verification restrictions. In such cases, some players use an alternative method to add in-game currency umamusume top up. This usually involves entering a trainer ID and selecting the appropriate server, after which the funds are credited to your account and become available in the game.