How to deploy Word Macro/toolbar

I have an Word environment controlled by Group Policy where the User Templates paths are unique to each user (eg their Home drive), but the Startup and Workgroup Templates paths point to network shares that are common to groups of users depending on their department (eg Finance, Marketing etc).

My situation is that I have a new macro and associated toolbar button that I need to deploy to a subset of users from across different departments. Ideally I want to control it so that only members of a certain AD Group will get it. At this stage all I can think of is to copy the macro and toolbar manually into each users normal.dot. Anyone else out there have any other ideas?