451 ED cabrio does have interior headliner. It does not have tailgate EVSE storage as it is configured for rails and there is no alternate place to "store" cable as with the ED coupe.Is the cabriolet top just one thickness of canvas between you and the elements or is there some kind of interior liner? In the coupe, the tail gate has a compartment to store the charging cable. I think on the cabriolet that compartment is used to store the side rails. Is that correct and if so, is there a place to store the charging cable? What issues have you found with the cabriolet that may not be issues with the coupe?
451 ED cabrio is noisier (both wind and road) than coupe which might distract from the EV silent running.
On the other hand, you live in a mild climate so the top will be back most of the time adding that "kewl" factor while not using any battery power to cool/heat the interior!
451 ED cabrio may not be as easy to load up that Costco shopping cart as a coupe hatch but no real issues, just a matter of taste.