The pharmacy's are using what now? Gonadorelin is GnRh, that's for stimulation of pituitary to stimulate LH production. It needs to be delivered through the whole day in app 2h intervals and you also need a serm to block the e2 receptor in order for this to work. That is totally possible to do and people have done it before, but you need a pump or something, like an insulin pump, in order to deliver the gonadorelin every 2h ...
A proper hcg routine has already been posted, so I wont comment to much about it. But do know that test in it self, in larger quantities, is able to stimulate spermatogenesis. This is why you might have fuller balls on 500mg test vs a trt dose.
I personally am very sensitive to acne from hcg's estrogen and usually, 125mg ed is all I can afford and even that can be to much. But anxiety and low libido start creeping up if I go much lower ...