There is also no doubt that you don't it for VFR scud running around Europe, and quite possibly won't need it for many years if ever.
By the way, I belive that the BENLUX and Germany demand mode S for all flights, VFR too.
That is the point the CAA started from, except they wanted gliders as well. After a huge effort on the part of the LAA and its allies we convinced them it was not technically feasible given current technology.
What is the problem to add a small air driven (by a prop) alternator to the wing or the aircraft's belly?