If it were to be implemented I see it like this. The crafter initiates it with a NPC and the protector(s) could get bonus SP for mobs killed within a certain radius of the intended camp. It would need say a 20min timer before the bonus wore off (starting from the moment you pass the marker on the map showing you are in the intended area.

Also if the crafter who initiated it dies then the protection quest ends and no warps home, to give incentive to actually get the job done right

Upon arrival at the camp they could also receive a small gil reward similar to what you get at the end of a behest.

The only thing I'm still wavering on is getting back. I suppose once the items are turned in the crafter could initiate a return warp to the town they started the Crafter Protection plan from