* Use the same account login/password on the client and server so that you don’t need any credentials in the credential store.

* Create a scheduled task that deletes the MYSERVER\HomeGroupUser$ from the credential store. I created an .exe that calls the Win32 API:
::CredDelete(“MYSERVER\\HomeGroupUser$”, CRED_TYPE_DOMAIN_PASSWORD, 0);
Once this user is deleted, Windows will fall back to connecting using your local username/password on the client.