you may try to reveg it and then take clones and bonsai that clones. its not hard to bonsai cannabis. you just have to de-pot, prune the roots and repot again always in the same tiny container but its gonna want to grow upwards so bend and tie constantly.
i dont keep bonsais to take clones i keep bonsais so i can flower them directly and take new clones to bonsai. this way i can hold upto 40 moms in a 2x2 for months and years just be ready to do some work every month or so.
its always better to grow from a bonsai by the way seedlings take longer to achieve that kind of growth even a battered, unhappy bonsai can really explode with growth as soon as you give it a bigger pot.