Need a process to join EV sites (2 separate directory databases now, want 1 in the end)

I don't seem to getting the traction here so wanted to word it a different way, maybe my explanation of what I was trying to do didn't compute.  :)

EV for Microsoft Exchange was set up by a geopartner years ago and configured as two separate EV sites (2 separate Directory Databases).  We are now attempting to reorganize Enterprise Vault into a single EV site.  I thought that Akaibu Evolve would do the trick and have since discovered it does not.   The advice received was to join these two directory databases in SQL.   I'm not sure this is the correct (and supported) answer, anybody have any insight?

Note that there will be an EV presence on East and West coast as I'm setting up FSA and SharePoint as well.   Existing email archives will not be moved.

Also, Discovery Accelerator is in the mix.

KT