I know this is old school but it worked in Sacramento, CA last spring. I cut some cuttings from a neighbor's unknown fig tree. I placed the cuttings into a potters pot with the local clay soil from the ground and watered. Basically, more than half of them them grew leaves. They are dormant, I guess now. Will see this spring if theyare going to continue growing. I guess I will add your idea for the next set of cuttings which I hope will be known figs.