Hi Charles,
The notice is on Visuris but I can’t seem to paste the link on the only device to hand. It was dated 03/03. If you narrow your search to just the Kanaal Nieuwpoort Duinkerke it might stand out more.
I have conversed with the powers that be. It will definitely not be possible to get through the Sluis. There will be no “windows” in the works. The stoppage only affects the lock, which will be de-watered throughout the period.
However if you are heading to Diksmuide from the east, e.g. Gent, Brugge, Nieuwpoort, then I don’t think there is any problem. I have not asked the specific questions since I am not going towards Diksmuide (or anywhere from the sounds of it!) but I am pretty certain that the Yser from Nieuwpoort via the St. Jorissluis will be totally unaffected, and I believe the Lokanaal from Veurne will also be unaffected. I suggest you plan on using the Yser, which is the quicker route anyway. Indeed, I have just been offered the use of an alternative mooring on the Steigers on the 8nland (easr) side of the Gravensluis, on the understanding I can get east from there, so your route to the St. Jorisluis should be open also.
Balliol.
p.s. Just in case you are confused, remember that the affected lock, the Nieuwpoortsluis, is in Veurne, immediately east of the haven. The Veurnesluis, which is unaffected, is in Nieuwpoort. Simple really!