I cant believe that some kind of companion hcs were not in the pipeline for secret wars. Maybe they want to battlebox again or something, but this event was tailor made for companion omnis. If I am not mistaken all of the stories were essentially mini series without major continuity issues. Prior knowledge of series was not required because they were all transported one place or another. Can anyone confirm or deny?
The issue with civil war and other ties in omnibus was that you basically needed to be reading the series to get the full experience, and from what I understand thats not the case for secret wars.