Replace Joomla User Registration with Hikashop

Hello,

I have a client that wants to require users provide address, city, state zip on registration, along with name, username and password, so I'm thinking that if I hack default_login.php to redirect the Create Account link to a Hikashop registration page instead of the Joomla registration page, that might be all that's necessary.

Is this a reasonable way of accomplishing this or is there a way to do this without hacking Joomla files? Since I'll probably be using Hikashop on this project anyway, there's no point in using some other third-party registration plugin if Hikashop can get it done.

Thanks,
Ed