Check out Robert Walters (http://www.robertwalters.be). They seem to post a lot of consulting jobs. Most of them are at Bain or McK, so I guess they have some sort of connection to those companies.
Another good website is www.eurobrussels.com. This site lists all types of consutlancies with focus on lobbyists and think tanks. But quite interesting if you fancy sth else than strat.
Languagewise you will certainly have a disadvantage not speaking dutch, but it will all depend on the ongoing projects...