Medical standards for NPPL(M) and NPPL(SSEA) are the same, but it is generally easier for a microlight flown by an NPPL(M) holder to fly across European borders because of historical agreements set up years ago by the BMAA and others, than it is for a light aircraft flown by an NPPL(SSEA) holder.
So yes, I think that microlights may well be the way ahead - but any international flight will be in your own aeroplane, or with an instructor in a local aeroplane. No variation of NPPL has validity in a non-G aeroplane.
G