Edheldur said:
In my campaign, I've been using the Reducing level adjustment rule from Unearthed Arcana, and haven't had any complains about it.
It's 3rd level if you LA is 1, 6th and 9th if its 2 (1 at 6th, one at 9th).
You can find all the relevant information about it
HERE.
Using the info on the SRD as basis, here's a revision of the feat...
Reduce Level Adjustment [Metagame]
You are exceptional for a creature of your kind.
Prerequisites: Two ability scores of 18, character level 6th, must have a level adjustment of +2 or higher, XP cost (see below).
Benefit: Your character's level adjustment is considered to be 1 less than normal. This reduces the character's total effective character level (ECL) by one for the purpose of all game rule benefits and restrictions.
The character must also pay an amount of XP equal to (his current ECL – 1) x 1000, as per the rules given in D&D Unearthed Arcana (pgs. 18-19). This amount is immediately deducted from the character's XP total. The deduction should reduce the character's effective character level (ECL) by 1. (If this deduction would not reduce the character's ECL by 1, the character's XP total is set at the maximum of the level below his current ECL instead.)
This XP cost can't be reversed in any way, and the payment must be voluntary on the part of the character. The payment must be made immediately upon the selection of this feat.
You cannot use this feat with Monster Classes.
Normal: You must apply a character's entire level adjustment to determine its total effective character level (ECL).
Special: You can take this feat more than once. Each time it is selected, your' character's level adjustment is reduced by 1. You can never reduce your character's level adjustment to less than one-half of its original number (rounded down).
For example, if the character is a doppelganger (LA +4), then its level adjustment can only be reduced to a minimum of +2, by selecting the feat twice. A bralani eladrid (LA +5) character could also be reduced to +2 (rounded down from 2.5), but it would have to take the feat 3 times.