How To Add/Remove Groups To "Local Admins" Remotely To Multiple Computers

Hey All -

I've got a lot of domain-joined workstations that require me to add and sometimes remove "Domain Users" to "Local Administrators" for our software.

I know how to add them the following ways:
* Adding Domain Users to Local Admins while logged into the workstation through computer management.
* Doing the process above but from one computer choosing the "Connect To Remote Computers" option in computer management and browsing to each computer

What I'm after is a way to do it globally and many machines at once since the above methods take forever.  Something like a group policy settings would be perfect.  Someone suggested that I could create a security group and add their AD account to it's membership, but I don't know how to configure a security group to do that.

The reason that I need local admins is because our software is written to where changes need to be made for it to work correctly.  I want to disable Local Admins for security purposes, but this software requires it.

Any suggestions are appreciated - Thanks!