Dear friend, this is a very interesting question. Unfortunately, the answer is not very encouraging. At the moment we can not interfere with spermatogenesis in terms of cell mechanisms completion, therefore we can not force evolution of spermatocytes or spermatids to mature spermatozoa. On the other hand, there have been some attemps in the past to use spermatids to fertilize the ovum. Those attemps were rather unsuccecful due to low fertilization and even lower pregnancy rates. Those teckniques are not in use any more. The most probable and effective solution in order to achieve a pregnancy would be sperm donation. The use of antioxidants (vitamins, selenium, folic acid etc), cessation of smoking and alcohol consumption and proper nutrition for at least 3 months might enhance spermatogenesis. Thank you for your question and I hope I was helpfull. Always at your disposal for any other quieries you might have.