There have been rumours for some considerable that MMC were intending to build a three-wheeler and this has always been denied by the company. However, at the briefing on the Centenary programme held at the Mog 2008 event by some representatives from the company, the question of a trike being available in the Centenary year was mentioned, but no further details were given.
I have not followed up since then, but maybe your letter will elicit a positive reply. Let's hope so...