Is it possible to change the mailbox to the previous one?

Hello everyone. Many years ago, I registered an epic account for my son to my email address. Over time, I also wanted to play Fortnite in particular, and I had to register my epic account to my son’s email address. This is very inconvenient, because to confirm I need to log into my son’s email address, and he needs to log into mine.
That’s why we want to change email addresses using an intermediate one.

  1. Change the email address of my epic account (from my son’s email address) to my wife’s email address
  2. Change the email address on my son’s account from my email address to his
  3. Change the email address on my account from my wife’s email address to mine.
    The instructions say that you can’t use an email address that already has an account. But nothing is said about whether you can use an email address that already belonged to someone else.
    The question is, will it work?