When their bones are picked clean and the clean bones gone, They shall have stars at elbow and foot; (4-5)
We don't get any specifics as to how exactly we are transformed here, but we're sure looking pretty cosmic. The repetition of the word "clean" gives the impression that we're all starting off with a clean slate.
Under the windings of the sea They lying long shall not die windily; (11-12)
If the sea symbolizes life's twists and turns, we can assume that the afterlife is less confusing. There's something very simple about the transformation that occurs since those lying long will not "die windily."
Though they be mad and dead as nails, Heads of the characters hammer through daisies; (24-25)
No matter the earthly circumstances, the persevering and transformative "character" pushes through those daisies. So here we get the feeling that we're all transformed into simpler characters without all the madness.