AutoCAD Visual LISP / AutoLISP :: Convert ObjectID To Handle

I wrote code for an application that stores links to lines and blocks in dictionaries using handles.  The routines work well and I can manipulate the data marvelously, but if one of the lines or blocks get erased the whole danged opera falls apart.  I knew this when I wrote the routines and have always been careful about using the ERASE command, as a matter of fact, I considered disabling it.

I am trying to make the package more robust.  I have been experimenting with attaching a reactor (:vlr-erased) to the objects which fires when the object is erased.  Unfortunately it fires before I can retrieve the handle of the object so that I can remove the references from the dictionaries.  The only thing that I can retrieve once ERASE fires is the ObjectID.  I can't seem to find a Visual Lisp routine to convert this value to a handle, does one exist?  Is there an ObjectID collection that has any references in it?