Except that a TRUE optimizer knows that you can do that with a Wizard, Cleric, or Druid, no splats or PrCs needed. Hell, there's only PrC that's actually a power-up for druids at ALL.
Nothing wrong with that, embedding narrative hooks to the chosen mechanics makes for a stronger game.
Fochlucan Lyrist. Oozes flavor, but yea, the entry mechanics are so harsh as to weaken the character severely.
But the argument about your players not being powergamers isn't really relevant. The argument from our side (at least, my personal framing of the pro-4e camp) is that the game should support your powergaming, and not break. Period. The theory that you should weaken your character deliberately to really "roleplay" is an artifact of an earlier time that should have died with 2nd edition. (Sorry, Rath!)