OK, that can work, but it would also require a good amount of work, as self-provisioning is meant to give you the best experience on a greenfield deployment, or for new users.
You'll sync your users from LDAP, automatically create the line for each user, and associate it with the user, and then just give the user a phone, have them plug it in, let it auto-register, and then the user dials the IVR and enter their self-service ID.
I have not tried using self-provisioning with a phone that already has a config, I'd believe that would work, not sure if the fact it should already have a userID associated might prevent it from working, or not changing it.
Now, for what you want, this would assume you would need to create the new line for every phone you want to use with self-provisioning, and also assign it to the user as their primary extension.
If they're going to be local users, you can use the quick user/phone add, or if they're LDAP, you can create the user with just the basic settings, and the line, and sync them to CUCM.
But you'd be forced to create the new lines, and associate each one to the relevant user.
Depending on how often you do this, you might want to have a really huge auto-reg pool to avoid having to keep track of which is the next DN and avoid running out.
HTH
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