When I used to fly VFR down there, I never had any trouble in Belgium. They used to give me a transit of their Class C, at say FL085, sometimes with vectors to avoid traffic, etc. A breath of fresh air compared to the ultra-rigid UK system.
Unfortunately one cannot rely on this treatment, definitely not in much of Europe, which is why with VFR one needs to have a Plan B which is a route wholle outside CAS, and a decent GPS which allows one to execute that plan in a hurry if the next CAS transit is refused.
Germany was easy too.