Hello,
if you are planning a course midst of next year, you might contact Aldo Ferrucci in the South of France. He speaks fluent french and english and i did my megalodon hypoxic trimix course with him and can recommend him highly !! (I am from Belgium and am Dutch-speaking just like you)
He has rental units and spares and ... a warm and blue sea without tides...
have a look at bubnotbub.com or contact him at
aldoferrucci@free.fr with my regards !!
johan