The working of the auto-locker is not quite that simple. There is no "logic" to sense slippage. It is all based on where and when torque is applied. If you are accelerating, then the locker is solidly locked, but if you back off the gas, it will ratchet because of the shape of teeth on the plates. It works, but is a PITA to drive on anything remotely having traction.

You don't want to weld. You can't always get out and unlock a hub and you really don't want to be doing that. Besides, with one hub locked, you are putting 50% of the torque through one axle and one CV. Again, not a good idea.

If you can find an ARB, it really is the best for the front end. The Aussie is second and welding it is a distant distant third.

Good Luck,
Michael