I was looking for same question for another purpose, and I think I found one solution, but it requires that your moodle admin activate one advanced feature. Look at:
It looks like we cannot hide one section and have its activities inside available from other sections via links, BUT, we can have one section with some activities hidden AND accessible (called "stealth" or "furtif" in french)...
My wish is to change the display of 28 quiz activities, instead of boost-theme long text-list, I wish to present them via icon-cards-links, with nice icons and title and colors. I will thus create a section with:
- One visible resource: either a label (html content displayed inline in the section view) or a page (separate view, student will have to click to look at the table of cards) with my table of 28 nice looking cards (linked to hiden quiz activities "Stealth mode" in same or other section)
- Add 28 quizzes activities in mode "stealth"
Would that fit your request also?