Here are couple of clarifications:
The only magic shop in Brussels is indeed A&T magic shop. Adress above is correct (it is at walking distance from the "Grand Place". It is no more run by the Raimoni family but by Alex and Thierry Lewis and ideed, identify yourself as magician to get access to the magic part of the shop.
Select Magic (www.selectmagic.be
)formally "competitor" of Mephisto in Kortrijk purchased the reminder of Mephisto inventory and there indeed located outside of Brussels (about 1:15 driving).
The restaurant that propose magical entertainment is "The Magic Rubens" (www.magic-rubens.com
) also walking distance from "Grand Place".
Hope this help.