Hi Matt - I think you can solve your problem by setting up a shortcut key with the script on it from here:
http://kyticka.webzdarma.cz/3d/moi/#SelectLastCommandCreated

Paste in that script for "SelectLastCommandCreated" into the command part of the shortcut key and then when you push that key the new objects that were generated by the last executed command will become selected.

That works with the output of any command, and it should give you the hook you want to access those particular new objects in the situation you were describing.

- Michael