This way the original account holder lose the activation/confirmation code

It's the "click this link to lock the account" that makes me wait 2 weeks.
Yes, I was talking about this locking the account link in the email. Sorry I messed it up with confirmation/activation terms

You can bypass this 2 weeks waiting times if you do this two email steps because once you add your second email then the locking the account link goes to your first email (the temporary email) and the older locking the account link in the main account's email do not work anymore.