Quiet install on restricted user with admin credentials

I am currently running Office 2003 on all my XP workstations. The users are
restricted users and NOT admins on their stations. I have created the MST
file with my settings. I have created a batch file to install as /qn+

My question is.

Is there a way to force the instalation to runas admin (where I can supply a
password in a text file possibly) without using Group Policies. The problem
I find with Group policies is that if I remove the computer from the group,
it becomes difficult to make modifications. Or is there a way to configure
group policy to do the installation but then disassociate this computer from
the policy after that point?

Thanks,