Update HomeDirectory Field when User has a Specific Group added (and removed) to their account

I need to update the homedirectory field when an AD group containing "FranchiseRoyaltyAdmin" is added to their account. I also need to clear the homedirectory field when an AD group "FranchiseRoyaltyAdmin" is removed from their account. The group will be added after the user account is created.

How is the best way to accomplish this? I tried filtering on the Memberof field in the workflow when a group is added or removed, but am not having luck getting the workflow to fire.

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