Alright, I had time to try it out but there is one problem left: each listitem (that I customized with position-overriding the seb_one template) is encapsulated by an absolutely ridiculous amount of unnecessary containers caused by the seb_blog template. Because of that, the :last-child css-selector does not work because each listitem is the last one in its own container. I think I now need a way to get rid of those extra containers for the :last-child selector to work.
Any ideas on how to do this or different suggestions?