You can turn an NPPL(M) gained in flexwings into an SSEA with the appropriate differences training, as much as is needed to pass the SSEA skills test.
NPPL allowances
If you want to turn that into a JAR PPL, you will need to have done the PPL minimums, ie 45 hours total time (35+ in SEPs), 20 hours dual with a JAR instructor in SEPs & 10 hours solo in SEPs.
LASORS, section C
The EASA version of the NPPL, the LAPL will be available from July 2012; the minimum requirements are less than for a JAR PPL but, unlike the NPPL, there's no credit for microlight time.
EASA FCL