Sorry for the disorganisation… I will clean this up, but I’m just trying to get it all down as I find it.
Links to follow up with later:
http://www.gamber.net/cyclebel/index.htm
http://www.bikely.com/maps/bike-path/Belgium-cycling-routes-by-Fietslogies-summary
For those who want to follow EV5, there might be a nicer way than I have found so far. Find it and compile it! [For example, I chose not to follow RV 35, from the Luxembourg region cycle map, up toward Huy because it looked more hilly... but the whole last part of it is along a river, which might be rather pleasant. Plot both, look at the altitude profiles and compare... ]
Even so, there might be a much nicer way to cross Belgium than EV5’s suggestions…
Also, if you’re having trouble finding info on the Escaut river/canal while searching in English, perhaps it’s because it’s called the Scheldt (Dutch: Schelde, French Escaut). http://en.wikipedia.org/wiki/Scheldt
I also just learned that Brussels, the capital of Belgium, is home to so many Dutch speakers that people here say it is a bilingual city. Had no idea… Explains why the military guy asked if I spoke Dutch, when I told him my French was terrible…
PS – Indeed! The bikely map link above will show that Ronse is not on any of the water ways, and that the EV5 directions only have you stay on the River Escaut for a tiny little bit. According to this guy http://www.gamber.net/cyclebel/escaut.htm, it’s a really nice ride all the way up to Gent. It’s unclear to me which would be faster/better/nicer/easier/whatever. I’m tempted to head up to Gent and then down to Lille/Roubaix, all along river-side cycle paths… but I will remain faithful to my goal of following EV5 to the best of my ability and reporting on the status. That said, I imagine I’ll end up recommending following those river paths or others like them, especially because they seem well documented already. More later, hopefully more organized…
PPS – too much content to dig through!
http://www.beeusaert.net/website/cartes.html links to LOTS of map websites for the area. One of them is rando-velo, which I clicked on because I’ve been following “RV” routes on my paper cycle map…
http://www.randovelo.org/fr/veitin.php, which shows RV10 going directly from Namur to Brussels (and one directly from Champlon, where I am now, to Namur… it’s labeled as RV 6… I wonder if it’s the same as the RV 60 that I just got from this cycle map and put into my GPS? Upon comparison, yes, it looks exactly the same. BUT NOTE!!! This RV6 link goes all the way to Lille, bypassing Brussels. Another option to mention in the cycle-path choosing… also note that I have never seen a signpost for an RV route and I’ve been ostensibly following them for 50+ km.)
That first site also links to here: http://www.fietsroute.org/Long-Distanceroutes-LF.php which mentions LF6 going west from Brussels.
Nevermind, here is http://www.vlaanderen-vakantieland.be/nl/themas/themadetail/&ThemaID=47. google translate tells me that all the LF routes are fully signposted and that downloadable gpx files are here: http://www.routeyou.com/news/view/228/toerisme-vlaanderen-biedt-lf-routes-aan.nl
From there I find this confusing interface: http://www.routeyou.com/group/view/1508/lf-routes.nl
Which yields, in bits and pieces, after clicking around a lot, LF 6 from near Brussels to Ronse. They include information points, camping spots, elevation profiles, and all sorts of information useful to a more organized cycle-tourist 
piece 1: link
piece 2: link
other pieces of LF6 don’t matter to me at the moment…
Garmin also has a cycling/hiking CD for the area for 100 euros… maybe if I lived in Belgium or Luxembourg.