Be careful with planning for Belgium. Last news I heard is their IT system/Question database is so old EASA blocked them from having theory exams. Check before you do anything there.
An option for theory could be Austria. The exams are in english. Orbit groundschool in Arnhem is an exam location for them. And the dutch authority accepts the theory from them. This is valid for the ATPL I'm doing. Check if it works for PPL as well.
If you stay local and live in Amsterdam Lelystad and Hilversum are the place to go. With Hilversum only for the TMG.