Mr Nilbog,
As a possible solution, is there any way to apply the crown as an equippable texture to Dain Frostreaver IV? He always drops
Dain Frostreaver's Head, could you change this to a Head slot item, but change the Race to NONE so no one else can equip it? I believe it being no drop will prevent it from showing up on charmed pets if anyone was silly enough to try it.
Basically when Dain spawns, have his head equipped, would that get the crown to show without interfering with his legs? It is an unclassic fix, but not nearly as noticeable as his missing crown.
Judging by the picture, the crown is level on his head, so can maybe just truncate the image file of his upper head and splice it on?
Edit: upon further reflection, maybe spawn him with no head and have his head with crown be the texture?