Guys the article I read this morning was talking about the need to re-register securities-common shares- after a D/E swap. There were no other examples of the need for re-registration.
After all, if you have a D/E the trups would be gone because they were swapped for equity! Thus you would have a situation of a co with 'new shareholders' and no debt... (Then what would Tric trade? They've said they want to be able to trade the trups.)
Thus to me as I've said, it might be unlikely to have a D/E.