As to a way of bringing elves up to popularity, but staying in concept, how about a "channelling ancestor" set of lines that would allow the character to operate above their character level for a period of time. Boosting saves, skills, BAB, caster level for a while?
That is acutally i pretty cool idea!
Also signed for the OP's suggestions on weapon based enhancement lines. While far from being overpowered they go nicely with the flavour of different elf types (valenar, etc.)