The VX-2 is essentially a "convertible" VX. Obviously, the best and most economical solution to having a "convertible clone" of the VX-2 is to have your own hardtop VX professionally modified (cut-up) by a specialty automotive shop that performs custom convertible conversions.
I just googled the internet and there are plenty of professional convertible conversion specialty shops out there in the marketplace. I'm sure with the right amount of money, they could perfectly transform a normal hardtop VX into a VX-2 "clone".
Your best bet is to find a local convertible conversion specialty shop in the Los Angeles, CA area (of which should be many due to TV/Movie celebrities). Then have one or two of their skilled employee's accompany you at the Peterson Museum so they can have a hands-on look at the original VX-2 and they can invision exactly what the modification entails (and estimated cost).
The likelyhood of a VX-2 convertible going into some sort of mass production is between slim to none and would be cost prohibitive. If an individual desperately wants a VX-2 "clone" that bad, then they're just gonna' have to pony up the individual money and have their own hardtop VX professionally transformed by a convertible specialty shop. Heck, it only takes money-- TV/Movie celebrities do it quite often to their privately owned vehicles and don't even bat an eyelash.
For me, I am absolutely happy with the electric-Moonroof I have installed in my VX. It doesn't leak a drop during torential Washington State rainstorms and it provides me additonal sunlight when it's closed and additional fresh air when it's open. Plus, when I park the VX for extended amounts of time (like at a ballgame or movie), I don't have to worry about some thug cutting my convertible-top canvas just to gain access to my vehicle's interior. For an electric-Moonroof in the VX, the cost is about $1,500 (+/-) which is a hell of a lot cheaper than a full-on convertible conversion just to get additional fresh air into the cockpit. If I wanted a convertible that bad in my life, then I'd just buy a vehicle that came from the OEM factory as a convertible. Just my 2-cents. 'Nuff said.