There are several stone pines, but I don't know of one that has been propagated from a cutting. Your's may be the first,there is always hope. Al

Usually conifer cultivars are side grafted onto rootstock of the same species. As an example our stone pine has viable seed(future weeds)so I would use some of my tree band (two year old) seedlings as the rootsock for a particular cultivar. I dont remember the best time of year to graft conifers though.
Good luck though with rooting the cutting. Nov is a good time for rooting conifers if they are capable of rooting.
-Trent