What i think the VX-20 boats are is just a M20 with a jib, (and maybee other changed features).
It has raced a few times at other Dutch events as well.
It is not however a M20 with a jib. Or rather while it looks likes that, it isn't. It is the M20 platform (hull+beams) with a Tornado carbon mast and a suit of sails based on the Tornado rig. I'm not sure as to what width it is. The M20 always used the Tornado rudder setup so that is probably still the same. Anyway it is not a M20 with an after market jib. It is a marriage between the M20 and Tornado designs.
And that is why changing over to that concept will be practical. The crews just change out platforms + daggerboards and use for the remainder the old gear of their Tornado's.
Wouter
