How to send reset email link in the "new user" email?

I’m trying to send the reset password link in the “new user” email. My problem was that this is link with token, so I can’t do it hardcoded with the reset password link+username.
How can I add to the new user email the reset password link? (I wan’t him to reset the password immediately after creating his account, so I (administrator) will not know his password.
(It possible also to send reset password mail in a separate mail, but the current workaround that I found in the forums- that the customer will type wrong password to get the link for resent password is not acceptable).