Catch AutoCAD on Shutdown after Fatal Exception?

I have this application I'm working on where I can't just start it in a try{}catch{} in a CommandMethod.  In fact, the best way (too long a story for this post) I could initialize some objects to manage WCF callbacks in the main application thread was via a combination use of the IExtensionApplication's Initialize() and Application.Idle event.  That part works wonderful, but with an unfortunate side-effect.  If AutoCAD crashes due to some fatal exception, I'm unable to report back to the WCF service the change in AutoCAD state. 

So, basically (without going into a lot of detail) the question is this:

How do I capture an AutoCAD crash event so that I can finalize closing of specific resources when initializing an assembly via the IExtensionApplication's Initialize()?

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