I don\'t know if Toyota makes a DS drop. If you are sold on keeping it Toyota, you\'ll have to do some customization. Xtreme 4x4 did a mod for their little tube buggy rotating the knuckles and differential. It is some work, but it would still be all Toyota.
Another option for a new axle with e-locker is a MOPAR D44 for a Wrangler (4.11s). Cut off the mounts and put yours on, 12v and viola! Sounds easy, doesn\'t it. It\'s not. Also, not sure how comparable width measurements are anyway.
There are a lot of aftermarket custom axle manufacturers.
You\'ve got some work ahead of you...