I am also interested in this for client applications.
Does anyone have insight into how this would be accomplished, i.e. as an XEP-implementing plugin, new class extending xmlstream, etc?
I would consider doing the work if it was agreed upon how best to do this.
I have created the ticket here:
and will update as I hear updates.
Of course, if anyone can answer Rob's question in the affirmative, that would be a great head start!