Oh and additional question (the edit time) how much worse would a half-orc with double axe be with the same build?
You either go non orc and go for Twin Crystals or you go orc and use Faterender, whichever you prefer. Also orc saves you a feat, since you don't need exotic. If you go non orc you'll probably have to cut Accomplished Sneak Attacker for Exotic.
If I were to make a build around two bladed weapons it would be something like this:
Half-Orc
Str: 18 > 22
Dex: 14
Con: 14
Int: 12
Wis: 7
Cha: 15 >16 @ 4
Scaled Fist 1/Fighter 1/Alchemist 12/Archeologist 2/Dragon Disciple 4
Lvl 1: Monk - Dodge // Crane Style
Lvl 2: Fighter - Weapon Focus: Double Axe
Lvl 3: Alchemist - Dazzling Display
Lvl 4: Alchemist - Feral Mutagen
Lvl 5: Alchemist - Outflank
Lvl 6: Alchemist - Combat Trick > Two Weapon Fighting
Lvl 7: Alchemist - Crane Wing
Lvl 8: Alchemist - Feral Wings
Lvl 9: Alchemist - Shatter Defenses
Lvl 10: Alchemist - Combat Trick > Improved Two Weapon Fighting
Lvl 11: Alchemist - Crane Riposte
Lvl 12: Alchemist - Combat Trick > Improved Critical: Double Axe
Lvl 13: Alchemist - Double Slice
Lvl 14: Alchemist - Greater Mutagen
Lvl 15: Bard - Greater Two Weapon Fighting
Lvl 16: Bard - Crippling Strike
Lvl 17: DD - Combat Reflexes
Lvl 18: DD
Lvl 19: DD - Seize The Moment or Toughness
Lvl 20: DD
Mirror Image with extend rods. Fighter dip so you can use the best weapons you find until you get Faterender, WF is only 1 AB. For Twin Crystals go human.
Concept build, I didn't test it ingame.
Fuck the demoralize feats, you can't afford them and they are a waste. Just take a proper bard with you with Dirge.