Keep Viking Funeral as it is, but make it so a Sunsinger using the perk will gradually burn down with their own DoT (greatly reduced from what they inflict to others, but a constant ticking of self-damage. Health regen perks and flame shield still work, but upon death a Sunsinger with Viking Funeral equipped has a chance to bathe a small radius around their ghost with flames.
No no...scratch that...that's just silly...