Mercenary kit from IWD2?

I found this on the gibberlings3.net forum regarding IWD 2 and I was curious if it would be possible to create in BGEE or BG2EE?

MERCENARY: Mercenaries are soldiers who sell their services to the highest bidder. Traveling great distances in harsh conditions for coin and fame, the mercenary is a man or woman who must master a variety of weapons and styles to satisfy his or her employer's needs.

Advantages:
* Two extra proficiency slots at 1st level.
* One extra proficiency slot at 6th level.
* Carry weight increased by 50%.

Disadvantages:
* Unable to start with Weapon Specialization.
* Unable to achieve Grand Mastery in a weapon.