I just found the External Insert plug-in... very cool.   
 
I have been recording DI tracks in one of several lanes that were all sent to my "Reamp Bus".  The reamp bus goes out hardware then through the reamper to one of several amps, and then the mics (or hardware returns) are set as the input to other tracks.  I have been doing it this way so that setting the levels of the return from mics in track lanes is meaningful (Changing the level of the DI out track just changes the gain to the amp.. not effective), and I'm not locked into a particular amp sound as I can tweak the amps in real time. Amps are miced in another room.
 
With this External Insert plug-in, I should be able to use the DI track levels, and I won't have to mess with a dedicated reamp bus and returning the mics to their own channels.  This assuming the insert is pre-fader.

Unfortuantely, I can't have multiple instances of the external insert with same hardware IO so I am back to using a bus.. 

200bpm
Unfortuantely, I can't have multiple instances of the external insert with same hardware IO so I am back to using a bus.. 

 
Well, the external insert is designed to work with a piece of hardware.  But couldn't you bus signals to a bus, which then has the external insert going to your hardware?