Most aircraft, including gliders, will be EASA aircraft & require an EASA licence. The exceptions are:
microlights
light gyroplanes;
amateur built aircraft;
ex-military aircraft;
foot-launched aircraft;
“vintage” aircraft that meet specific criteria for date of design and manufacture; and
aircraft built or modified for scientific or novel purposes.
NPPL holders will be allowed to apply for an EASA LAPL if they wish to fly EASA aircraft & at the same time maintain their NPPL if they wish to fly, for instance, a permit aircraft.
The medical requirements for the LAPL are yet to be finalised. The proposed requirements were broadly similar to the NPPL with the notable exception that you would require an actual medical examination rather than the counter-signed self declaration of the NPPL.
From memory, post EASA the 'recency' requirements to maintain a rating will be identical for LAPL & PPL licences.
The greatest advantage of the NPPL system to someone like you would be if you could use your gliding club membership & train for an SLMG NPPL at a gliding club. Hourly rates are typically half the PPL/NPPL rates, no instructor's fees, no landing fees & a realistic possibility of a power licence in very few hours, a licence which could then be upgraded to include an SSEA rating with a little extra training.
If you do your training at a local airfield in typical GA training aircraft, follow Whopity's advice.