SP 2010 and DP 6.11's scripted solution

I have a perplexing issue. I'm trying to use moss_backup.ps1 to create a backup spec for Sharepoint 2010. The domain admin is MYDOM\Administrator. This user has no Sharepoint admin privs. The Sharepoint admin is MYDOM\SP.Admin. This user has no domain admin privs.

If I invoke PowerShell as Administrator as directed, I am able to "Set-ExecutionPolicy Unrestricted" but unable to create a backup spec due to having no Sharepoint admin privs. If I invoke PowerShell as SP.Admin, I am unable to "Set-ExecutionPolicy Unrestricted" due to having no domain admin privs.

(Names have been changed to protect the innocent.)

Has anyone encountered a similar situation? If so, how did you solve what appears to be a "you can't get there from here" dilemma?

Thanks in advance!