How severe is the break- and does this "Belgie" have a two screw trigger guard, or a single screw trigger guard. I am curious as what might have caused the break in the first place. Is this a pistol or POW shaped grip, or a straight hand grip with the longer tang and guard iron?
Usual proceedure is to spark test if the guard on your gun will hold a magnet-on the back in an "no show" spot- if the guard will not hold a magnet, all bets are off, and I'd superglue it with some scotch tape for backing, punch a drift through ther hole in the scotch tape to allow the set screw to pass through, reinstall and fuggetaboutitalready!!
