Macro to change revision scheme of revision tables

I've been hunting around, but can't quite find an existing macro that will do this for me.  I want to create a macro that will change all the drawing files in a folder so that the revision table is updated.  We're changing to a tiered revision scheme where prototype/developmental parts are at one revision scheme.  Then once it enters production, there's another revision scheme.  i.e. development is -.01, -.02, -.03, etc and production is rev A, B, C.  The reason being development doesn't require the same approval loops that we have in place for production.  Anyway, I'm checking my files into EPDM and I've setup a workflow to convert existing documents to the development revision scheme.  The problem is the revision tables on all the drawings aren't updating to the development revisions scheme even though the revision variable has been updated to -.01 for example.  What I have now is a bunch of drawings that say -.01 in the title block, but the revision block still says rev A.

Any ideas on how to change this?  Writing a macro seems to be better than Dispatch/EPDM, but either way, I'm a total newbie so I'm learning as I go. 

SolidworksApi macros