As you wish to fly abroad:
NPPL(SLMG) is a UK licence. You may not fly abroad with it as a rule.
As an exeption, you may, with a medical class2 and some paperwork turn it into an ICAO licence and fly a UK reg TMG abroad. But it's not the best route I would advise.
You may convert through a paperwork exercice and a LAPL medical your NPPL(SLMG) into a LAPL(S) with which you may fly EASA reg TMG's everywhere in EASA land, or with a class 2 into a SPL with which you may fly EASA reg TMG's everywhere in ICAO land
With a NPPL microlight, you may fly UK reg microlights in many countries, but it's on a country by country basis, with some paperwork involved (eg Belgium)
To fly a French reg microlight, you will need a French microlight licence, etc.
The less expensive, more fun (my opinion) and more time consuming way of flying is gliding.
If you learn in a sunny country and good instructors, in 2 weeks you may get solo. I don't have in mind the requirements for the EASA SPL, it might be achievable in 4 weeks. Anyway, everywhere I've been, you may fly gliders without a licence or badge, provided an instructor signs you off. Having a licence or badge is a sportsman goal, but not necessary to enjoy yourself in a glider.