I hope you are aware that Sigil will have no more updates nor bug fixes.
Since you are pondering workflow, you might think of the Calibre epub editor, which performs many, but not yet all of the same functions. It does not and will not allow book view editing, however.
Hopefully someone will come along with answer to your Oxygen question. But both Sigil and Calibre editor will do what you want to know about for Oxygen, if I understand the question correctly. The TOCs can be generated in both not from styles, but headings in the document, headings not being a stylistic, but structural element. Calibre editor will generate TOC from links, files or x-path.
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