the IMC/Night is not too much of an issue unless you have an IR which less than 1% of European pilots have.
There is a lot of truth in that but while one can obviously fly anything unofficially in IMC when
enroute, there is an issue with the build quality of these very lightweight planes: they tend to be rather flimsy and one would be pretty brave to be chucked around in IMC, perhaps collecting ice.
IFR certification is going to be really tough for most of them - even when it becomes legally possible.