Gil-Galad was an amazing elf with a spear. Read about him That and honestly, the elven weapon selection is a little bogus, I expanded it to allow for more fun fighting styles. Bladesong supports ANY of the weapons listed (fixed it). I fixed Song of Celerity, missed that one. And agreed, Bardblades would do well here.
All weapons in the Bladesong style get the AC bonus, damage bonus, etc. Strike of Celerity too. And I fixed the feat list to your suggestions.
By jove I think you've got it! Not a bad concept, actually! Why should Harpers have all the fun.
-X