Thanks T.J., very helpful.  My final implementation is this:

catch(e)
{
   document.fire('MSO:error', {ID: 'errorEventReg', 
Routine:'pageReadyEvent', JSFile: 'Event.Registration.js', 
Message:e.message});
}

This works nicely since the host page now can subscribe to to MSO:error 
event.  I'm trying to be careful to not create dependencies on external code 
and resources for this one, since this is a last-line-of-defense means to 
capture and give instruction to the user.

Any how thanks again, a very insightful post!
Karl..

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