Mike,
Frank Pennink is the architect who designed the third 9 (first 18 are colt's. He also designed the current Noordwijk course. I don't know if he was a 26 handicapper but I'd say he's managed to put in a few good designs in his time
What didn't you like about the third 9, especcialy compared to the other 18? But maybe it's to long ago to remember.
The other courses you're refering to are
De Pan in utrecht. A colt course which is on the next 50 list here on this website.
Roosendaelse in Arnhem. This is the oldest course in the Netherlands. Don't know who designed it. The dutch open was last there in '84 when Langer won. Very charming course.
The Hague is perhaps our finest links course. An excellent, very undulating Colt course. Unfortunately the very old clubhouse burnt down earlier this year.
Eindhovensche and Hilversum are very good as well. Holland an Belgium really offer some very good classic heathland an links courses. And I suppose for foreigners the're very cheap to play compared to the UK. I still can't believe some of the greenfees I'm reading about in the US.
Anyway John, Have a good time in Belgium, hope you'll enjoy it.
Cheers, Niels