There will be limited appeal for a Morgan with no spare, and it may well be that demand is drying up. If you can afford a new car it must be more fun to spec it up anyway from the bespoke list.
I wouldn't have a Sport, simply because the rear aesthetics are unappealing to me. The new Plus 8 would look far better with a spare.
The rarest of the Sports must be the Roadster or Plus 4? - if you leave out the Plus 4SS.
Production numbers (and colours) would be very interesting. In fact a weekly factory blog on completed cars would be fascinating, but it might be considered to be too commercially sensitive to make public in real time.