You’re lean - props! You also had some pretty respectable PRs in your powerlifting days.
While you’ve certainly got muscle mass, but I would like to believe you’re still able to put on a good bit of muscle naturally. I only say this because 5’9 at 165 is a relatively light weight and I’d imagine you’re able to do more with your natural genetics before going into AAS. My intent isn’t to steer you away from AAS, I’m just advocating for the safer route - which is to get near max genetic potential before cycling or going on BnC.
This being said, there is some research to support single blasts having a long-term effect. There is also anecdotal experience from a good number of people who have done simple test cycles and had good results. Some people (@hankthetank89) don’t believe in steroid cycles, and others (@RT_Nomad) do; I would attribute this to their own experiences, YMMV.
The safest way to do this is to get near max genetic potential, then follow whichever of these protocols: Steroid Newbie Cycle Planning
If you cycle off without issue, you may not need to BnC. If you lose nearly all gains in your post-cycle, then you may be better suited to BnC… I would recommend your cruise to be at a TRT dose (around 200mg/wk).
As for your concerns with having a Dr. - I don’t believe you need to worry. Get your pharma grade T, get some 27ga 1/2" or 1" needles, alcohol swabs, and run subcutaneous or intramuscular injections. These aren’t as big a deal as you think they are (this was a big concern of mine before starting TRT).