Zen DLU vs AD Domain

I'm working on a situation which maybe common these days, but I'm looking
for clarification.

We're using Zen 6.5, users with DLU policies logging into XP clients and
Nwclient 4.9.1
We have used DLU to manage local workstation accounts and it works well.

Our XP workstations will be joining a domain soon and our orgranisation has
many sites.

We think the domain joining will be carried out on a site by site basis.

For users on a site with workstions joined to a domain, they will have the
Zen DLU policy removed, and login to eDir and the domain using the same
account....great.

We plan for users without DLU who login to a site with non-domain
workstation, could choose a location profile that has the NT domain field
blank (and therfore login local), and login to the workstation using a local
account pre-setup for them.

But here's the infernal question...

A user WITH DLU login, into a Domain workstation.....This sounds bad!!

How much should I worry about DLU trying to create accounts on a domain
joined workstation??
What can I do in that case????

Thanks