I have been watching regularly on Trainline, SCNF and Eurostars own website to see when Eurostar tickets would be available for Paris to Antwerp for December 7. But both December 6 and 7 show no Eurostar trains available to either Antwerp or Brussels those two days. I know about December seasonal timetable changes but other days that month the Eurostar direct train from Paris to Antwerp is available. And I know about track works sometimes putting off when they can fill in the schedule. But if trackworks explains it any thoughts as to when these might be released? Or when I might be able to tell there never will be any Eurostar trains those days. I could go ahead and book the less than ideal OUIGO to Brussels and then a separate ticket from Brussels to Antwerp? OUIGO is showing at least two trains from Paris to Brussels on December 7, one about 8 am the other about noon. But OUIGO takes longer even to Brussels and means our trip to Antwerp is not direct. Appreciate any insight you may have.
Small insight: I honestly don't know how and if they are integrated today, but the direct train to Antwerp was formerly a Thalys product, while direct to Brussels-Midi/Zuid was always Eurostar. Because there are five or more trains from Brussels to Antwerp every HOUR, having a non-direct trip is not so bad, and there is no penalty for missing the connection you hoped for. And it's historically (at least) a common plan.
You don't mention if you are a rock-bottom price customer?