Pinus roxburghii is a low elevation 5 needle pine from areas that include parts of Pakistan, it is replaced by other 5 needle pines at higher elevations. It is more or less related to Japanese White pine and Eastern white pine, P strobus. I have never seen a Pinus roxburghii live and in person, so I would only be speculating as to what one would do when training it. Its needles are much longer than P. strobus, much like our North American native longleaf pines. I have seen a couple long leaf pines, P. palustris styled as bonsai, and thinking of them like weeping willows or maybe a "grass tree", is a better way to handle the long needles than trying to force a classical Japanese white pine look to the tree. Pines with very long needles are difficult to train as bonsai. But there is no reason to not try and be creative. The problems will not be exactly like P. strobus, because it is a very different tree than P. strobus.
I did notice in the OP's photo that the bark looked fairly rough. The rough bark on a young tree and the long needles immediately made me think of Long Leaf Pine, P. palustris. Which I have seen in person. Hence my thoughts on style.
The original poster is in ''terra incognita'' in that I believe he may be the first to attempt to work with Pinus roxburghii. Well, at least this is the first time I have encountered P. roxburghii, so I say go for it, take pictures, post yearly updates to let us see how it works out.