Cover to Thailand

Today I show a cover I bougt on Delcampe. You see two personalized stamps. The tab is the personalized part, the stamp is one that was issued for the stamp exebition BELGICA  in Brussel from 9-15 June 2001.

Maybe the fellow on the tab is called Jean-Paul Groenen.  These personalized stamps I could not find them in the Michel. The stamp with another tab is Michel 3048.  The stamps on the cover fits in two of my collections, personalized stamps an stamps with two currencies but will I soak them off??
BTW did you notice the cancellation when this cover did arrived in Thailand?? They use the Buddhist calender there.