David,
try Rainbow Aviation at Eindhoven Airport (EHEH), they have the sort of planes you mention available. +31 (0)40 2515 515 EHEH is a single Runway, military field (so slight differences in radio etc) but plenty of GA activity.
Also at Eindhoven is the Eindhovense Aero Club Motorvliegen (EACm) but you'd need to join the club before flying and it ain't cheap; I don't think they do a temporary membership.
At Maastricht/Aachen Airport (EHBK) is Limburg Air Services, +31 (0)43 364 6949, they also have plenty of training a/c.
Succes!!
TAFO
