Presently in the South of France, but flying back tomorrow.
Belgium is OK for Heli's
Sint Pieters Leeuw is indeed very practical (but closed on Sundays) Better to PPR via +32 2 361 21 21 (
www.hsb.be)
On the way
Namur (EBNM)
Liege (EBLG)
alll are Heli friendly
Close to Spa, nice Hotels with Helisurfaces. Landing indeed allowed outside agglomerations (defined by official belgian VFR charts), if owner agrees. I always request written (fax) approval from owner (question of insurance)
D3