Hello bro, well it looks like you have done your fair share of research. Good for you. I'd like this to be a lesson to everyone else. The more you know, the better you can help yourself and the better results you will get.
Now heres the big question. Are you able to produce enough test to live without TRT? If your Dr wants to give you test for TRT, you are below the bare minimum, which is that of an old old man. TRT is designed to bring you to optimal levels, that of a young buck! If you are already very low and plan to run gear for a period and then come off, you will probably have an even harder time recovering. In many cases, your best possible outcome will be to return to the low test you had before. Hard to say. In most all cases, once a 50 year old man starts TRT/HRT, this is a lifetime decision. Some guys can still have kids while on TRT, espeically with HCG, but this isn't 100%. Either way, the years for having kids are getting smaller in number at your age. If you wanted to have kids and are able to now, it wouldn't hurt to get that out of the way before you started cycling and doing TRT. If it isn't a priority, just make sure you go in understanding that this option could be off the table. In this case, once you finish your cycle, I would return to TRT dosing and continue on, living with a better quality of life, having normal high levels of test.