Hypersmurf
Moderatarrrrh...
If you were willing to forego the big armour, a couple of levels of Ranger'll get you the Two-Weapon Fighting feat without the prereqs...
... but that means multiclassing
6th level... and it depends on how the DM interprets "fighting in this way".
The 3E Main FAQ notes that if you wish to benefit from the AC bonus of a Defending weapon in your off-hand, you must incur TWF penalties even if you don't attack with the weapon. This is evidence in favour of TWF penalties being for making use of a weapon in each hand, rather than just being for using the extra off-hand attack that wielding two weapons allows.
-Hyp.
... but that means multiclassing

Once you are 5th level you will be able to do attack with both with a full-attack action.
6th level... and it depends on how the DM interprets "fighting in this way".
The 3E Main FAQ notes that if you wish to benefit from the AC bonus of a Defending weapon in your off-hand, you must incur TWF penalties even if you don't attack with the weapon. This is evidence in favour of TWF penalties being for making use of a weapon in each hand, rather than just being for using the extra off-hand attack that wielding two weapons allows.
-Hyp.