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I cannot find a limit in the specification for the allowed number of nestings. So, 9 levels are possible (be aware that some reading systems will only show 2 or 3).
As you know, it is not possible by using the HTML headers. Usually it makes a lot of sense to use those headers, but for headers level 7 to 9 you need something else. You already mentioned that.
However, you have to do that manually. Sigil will only create a ToC with headers for several very good reasons. Levels 7 to 9 you have to add manually.
You might want to consider creating a separate XHTML as ToC with links and identify that in the metadata as being a ToC.
It would probably be possible to script with sed to automate this on Linux (outside Sigil), but I am no sed expert.
So, within Sigil you have to do it manually.
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