Ya know how I hate to be picky, but again and again people want a cat and buy a dog. Then they get advice on how to manage the inverse dog. Baloney! Take it as it is and make it the best that it can be, -not at some nebulous future date after you try to preform un-dog surgery, but starting right now to make the best it can be. We need to discard the errant concept that there are some number of boxes with names handed down by the Emperor and all bonsai must fit into one of the boxes regardless of how much chopping, growing, chopping, growing, ad infinitum is required, or else. Baloney! You have an individual, it has some interesting features, work with them to make it look like a tree. If you must have a plant that looks like a bonsai, then go out and buy such a cat.
Take a drive through your city. How many trees & shrubs do you see that don't quite fit into the city tree, or suburban shrub, or park woody resident box? How many fit nicely into the Emperor's box? Do we rip out those that do not fit nicely into a named box or are these dogs just part of the scenery? Are some of them ~special~ because they don't fit into the box? This tree won't be a literati, or an informal upright, but it can be a tree of merit, in-between. It has some drama and can be made to look more dramatic. Right now the branches are helter-skelter and unappealing. Branches can be selected to keep or discard and some can be re-arranged into a distinct pattern. The branches should be either arranged/chosen to accent the lines of the trunk as in an informal upright, or to be as unalike and inconsistent with the trunk as in a literati. That alone would make the tree into something that draws the eye. That is do-able. You can design it to be the short needled immature foliaged tree or for long needles when they come, but either way you make a choice and proceed to make it ready for that eventuality.
Need time to figure out what to do? Fine, but right now you can clean out the twiggy dead wood, pinch leader buds and see what kind of back-budding you get in spring when you can take the next steps and by five years time you will have something interesting. Or you can try to change this dog into a cat all the while knowing that you can go to big box tomorrow and buy a cat for peanuts.
(I'm not a Pine person so I can't really advise on the technical end, but someone will step in here and offer advice on that end of the process.)