While I have never used this method, there may be still one more alternative method of increasing the amount of rooted cuttings one can get from the original plant. It is a technique that bonsai growers use when they want to create a forest grove of trees.
The plant material (fig tree) in half-buried in the soil horizontally, root-ball and all, making sure that the majority of the main-stem and branches touch the soil surface, even pinning down these sections if necessary. Think of the plant lying flat on the ground like a espalier, or like a plant trained to grow flat, on a trellis.
The bottom portion of bark can be removed everywhere the stems, and branches touch the soil. Eventually, roots will start from these points, and sometimes other places, and upward pointing branches will eventually become new "trees", and so will dormant buds that will sprout from the stems and branches. After these all form roots, the original tree can be sub-divided, and all this new plant material will have its own root system, and the original root ball will still live on to push new stems. You may very well get dozens of new, potential trees from the original fig tree.
It sounds complicated, but it really isn't. When used for bonsai, the new sprouts are not separated, but are allowed to grow, thus creating a forest "grove".
Maybe this propagation method might work with fig trees.
Frank