I don't know about this cultivar in particular, but most of these tend to be weak on their own roots, slow to grow, leggy, sensitive to cold, susceptible to disease, and probably a bunch of other things I'm forgetting to list.
That's not meant to scare you away from giving it a try, but when a species is rare in bonsai, there's often a good reason, and you should be ready to deal with setbacks and work around limitations.