There are several scripts out there to manually clean up your SUSDB, which then would (at the next sync of CM updates sync) remove those declined-in-the-susdb from CM.
This is the one we used: https://tcsmug.org/blogs/jeff-carreon/513-what-s-sup You can configure it with all kinds of options for any particular run. In your case, you might want to be very specific, like 'where title is exactly this', and your run it for those 5 updates you have listed.
Marking supersedence is trickier...it 'could' be done, but In My Humble Opinion, is more trouble than it's worth. Just marking them as declined in the susdb is easier and less hassle.