BTW, whilst I know that Belgium has a reputation for being flat, I will let you in to a secret...it isn't true. Well, the west (Flemish) bit is, OK, but the section you will pass through, has gently rolling hills. Quite like loads of places in the UK....I mention this now, so you will not be surprised
If you need help with the train bookings or whether they will carry your bike, for sure, do let me know. I'll need dates and rough times, obviously. (Don't know how good your French is and I would want you to have two shocks whilst over here)
Is there an official route? The map on the link isn't great...