That's totally retarded. What if your character's apprenticeship happens after 1st level? You suddenly can't be precocious anymore?
It should be "You can only take this feat before or upon gaining your first *caster* level."
In fact, I'm going to assume that Frank will allow that.
That means that, off the cuff, I'm looking at:
Human (Weapon Focus: Greatclub)
Barbarian 1 (Power Attack)
Barbarian 2
Hexblade 1/Barbarian 2 (Cleave)
Hexblade 2/Barbarian 2
Hexblade 3/Barbarian 2
Hexblade 4/Barbarian 2 (Precocious Apprentice)
Hexblade 5/Barbarian 2 (Improved Bull Rush)
Divine Crusader 1/Hexblade 5/Barbarian 2
Divine Crusader 2/Hexblade 5/Barbarian 2 (Three Mountains)
Geomancer 1/Divine Crusader 2/Hexblade 5/Barbarian 2
Str 15
Dex 13
Con 12
Int 13
Wis 6
Cha 18
If for some reason Frank doesn't like the Precocious Apprentice thing, I'll offer up an even-more-off-the-cuff
Human Wizard 1/Swashbucker 3/Barbarian 4/Divine Crusader 2
Str: 15
Dex: 13
Con: 13
Int: 18
Wis: 6
Cha: 12
And I'll go the 'angry drunken son of a recently-sacrificed nobleman' route.
I'm sure there's some problems with these ideas, but I haven't really had the time to investigate fully.