Chaps, as some of you may know, Brussels is now even more of a traffic fuck up than normal. Big road alterations there at the mo. So I suggest you avoid.
I usually go via Antwerp to miss out Brussels anyway. One of my biggest clients is there also but that has nothing to do with paying for fuel on the company credit card.
There are other alternatives such as a Southern loop via Lille but either way avoid Brussels.
Happy travels and see you in the bar.