A 28-year-old male with a known diagnosis of Kallmann syndrome presents to the fertility clinic with his partner. He has been on testosterone replacement therapy (TRT) for several years to maintain secondary sexual characteristics and overall health. However, he and his partner are now interested in starting a family. The patient is concerned about his fertility potential, as he knows his condition is associated with hypogonadotropic hypogonadism. He asks about the best treatment approach to achieve fertility. Which of the following is a standard treatment approach for fertility in Kallmann syndrome?