Have a look at the Siemens eline or Optex. Sia uses the spine now for everything. I understand Mr h point of using 7550 in factory etc but we don't use them for everything now apart from kings range
its like a virtual link.
You have a source then a destination. Quite powerful when needed. In your case id say a link source would be a latching code, destination be the vibe on your safe
sia uses the techmaster app to do the ra, might be worth looking at adding more to it as i havnt changed it in a while
http://www.thesecurityinstaller.co.uk/community/files/file/48-sia-techmaster/