I wasn't aware that Scrivener knew anything about wiki. They appear to offer some form of support for multimarkdown, but that's a different beast. There is no standard for wiki - there are many variations. Markdown doesn't have a standard either, although commonmark is close, but multimarkdown is probably close enough to get along with.
I suggest you need to be wary of "supports wiki" claims. Because there is no standard wiki syntax I'm guessing that while some software might offer limited support for importing a single page of wiki syntax text (of one style or another), it is unlikely to make sense of an entire wiki.
Regarding your biggest concerns...
1. I can't help with 1. Only you can tell what works for you and what doesn't (which, it is worth noting, is true with whether we suffer from an medical issues or not).
2. Apparently multimarkdown syntax supports footnotes. This suggests Scrivener might go some way toward what you want.
3. Page/chapter status is a project management issue rather than a document syntax issue. So it falls back to evaluating each product of potential interest.
4. Exporting ditto.
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