Is it possible to only use your Google account for Google Play only?
If you go to "Settings>Applications>Google" you can turn off automatic syncing to the device. For the login button there's two things you can do:


I think you can deauthenticate the device from your google settings.
Simply solove the problem by creating another account you use just to do work-stuff. You shouldn't mix private and business life.


Hope this helps :)