For the first, we developed a <mini-toc> element that allows us to put inline unordered lists of child topics wherever we want, optionally with introductory content. See:
<mini-toc><p>This is described in the following topics:</p></mini-toc>
This is described in the following topics:
Plus in Oxygen's PDF Chemistry, we apply the CSS keep-with-previous pagination property to keep the topic list with its introduction.
It's not exactly what you want (i.e. not in a related links section) but it's tangentially related so I figured I'd throw it out there.