I don’t know of any tool like that but would be cool to see. Especially if it had a region aspect so I can see beers available in my local area.
Belgian beers are tricky. The categories are extremely vague and applied just so it can be classified somehow. For example Belgian pale ale covers such a wide range of flavors it is almost meaningless as a a guide other than the beer will have some Belgian characteristics.
If you have a local brewery you could saddle up to the bar and pick their minds. They may not make what you want but they could point you towards places that retail what you want.