Ryan,

I'm not an expert on axles (actually I only know enough to be dangerous).

3rd members are usually considered bulletproof & will outlast any vehicle they are mounted on. There are exceptions but you should be fine without rebuilding the front unit.

I don't think that the LSD is a component that can be removed from the 3rd member. It's how the unit functions. I don't think that you will be able to transfer the capability to the new unit.

I've never owned a locking differential but from what I've heard, the clicking is noticable but not irritating.

By all means, believe what you read. A locking differential should never be used in the front unless you have locking hubs. Even if the unit could survive dry pavement useage, your steering would be unmanageable and probably even dangerous (i.e., go straight when you tried to turn). It's the nature of the beast.