Samba - Passwords

Ok, I know this has been discussed but I cannot find an answer to it anywhere.

I have a SAMBA server running in SECURITY=USER mode and working great. I have a list of userids and passwords configured on it and all is great.

The WinXP machines do not join a domain, there are lots of reasons for this in the environment.

What I want to do is allow the users from their WinXP workstations to be able to change their password on the SAMBA server, in a simple, clean process.

I have SWAT installed as a stop gap, but what I would really like is just the user password change option there...

Ideas?