So let's see if I've got this right. It is possible for the OP to go the cheaper route by:
1. getting an NPPL(SLMG)
2. adding an (SSEA) to the NPPL
3. converting the NPPL(SLMG &SSEA) to LAPL equivalent
4. do extra training to convert the LAPL to an EASA PPL(TMG & SEP)
The provisos being:
a. he needs a JAR/EASA TMG instructor to reduce costs further down the line
b. the NPPL must have been issued before 7th April 2015
It seems to me that for an ab initio student this is something of a win-win situation. Most importantly it gets him flying - for less, it gives him a European LAPL if circumstances prevent him from going commercial and a possible upgrade route if he does want to fly the big stuff.
Whilst a prospective commercial candidate might need to be a bit careful regarding the 'flavour' of motor glider instructor, the majority of leisure flyers would probably be fine with the LAPL route.