It seems to me that having a Pinned that isn’t “top” on its own merits is in contradiction of what the Top page is.
If you want to promote a topic on the Top page, I think a Banner topic is the best way. As I posted previously, if you don’t want to have it on other pages it should be easy enough to do with CSS. Have you looked into using CSS and found it to not be possible with the currently existing selectors?