OK well as far as whether or not kids are allowed in restaurants in the evening, can I first point out that MW do not own the Ocean Club, so it is Ocean Club's rules that would apply in terms of dining and not MW. MW do supply some extra facilities to MW guests at the Ocean club (sailing tuition, creche and kids clubs facilities), but they do not own the restaurants.
I have to say that I would be amazed if kids were forbidden from MW restaurants in the evening, especially in light of recent events (and I'm a veteren of some 7 summer holdiays). However it is the norm for the children to have their tea later and the adult meals tend to start from 7:30, so in general very few under5s eat their tea at the adult meals. That is very different from saying that you can't have a 5.5m asleep in a pram at the table! But equally I have only rarely seen a family with say 3 children under 4 all come down for an evening meal - usually the children are asleep as they've been swimming all day!And for avoidance of doubt you do have your children with you for breakfast and lunch, so it is not as if you are not eating with them, and parents are welcome to join in with the chaos of high tea if they wish.
There are services at most MW resorts set up so that you do not have to have your children with you at the evening meal, which for some families is a plus. Additionally in resorts where there are several restaurants to choose from, one of them may be designated as adult only for the evening meal.
As far as the OP goes, personally I wouldn't use the Ocean Club. Firstly it is not controlled by Mark Warner so in some respects you're getting Ocean Club's rules imposed not MW. Secondly I can't imagine managing to have a holiday there at present and being able to escape from the investigation etc. And for me, a night creche wouldn't have worked that well, though with one infant I might have done so. But I prefer babysitting or the listening service.
If you are looking for a late deal then try their Corsica hotel. The hotel is a bit on the shabby side but the creche and childcare is very good, and the baby listening works very well as the nannies are physically positioned on each corridor all the time (so more secure as well).