Ok guys I searched little bit and here are few downloads wich will make your belf paladin to almost perfect Deathknight!
Spells Swap-> Clickie by mmmyowned
Paladin Horse to Gray Paladin Horse -> Clickie by Nomada
Blood Elf to Death Knight Belf (Draw)-> Clickie by trollpaxton
some SS of end resoult as requested:
concencration
Casting holy spell
Holy & Flash of light
Seal of the crusader
Shadow horse
Seal of command
Enjoy
*EDIT1*Fixed first link
*EDIT2* edded SS's