In my opinion, if you do that route, you will tear up your front end, asking so much of it, without a locker in the rear
A locker in the front is hard on componants as it is, and that is with a lockerin the rear already. Your joints (Birfields) are fairly weak, also, do you have power steering? Cause you WILL want/need it if you add a locker to the front. I sure wouldn't weld them up on a stock sammy front.. but then again, I have friends that have, but not without some sort of locker in the rear.
I understand your reasoning, but you would be WAY better off saving for an ARB for the rear, IMO.