Hi.
Good that you are trying something, cant just sit around hoping you would have down the line.
Hcg according to most in the know definetly suppress your own T. So for restarting i think it would do little good other than for the period you are taking it. The main reason for using hcg would be if u feel your testicles have shrunk during your propecia period. Or to maintain testicle size while on Trt.
Like Mew said, Trying nolva or clomid might be something to try b4 trying injections or gels. Id be concearned about messing to much with an allrdy messed up hpta when trying restarts. But talk about potential risks with these preperations with your doc if considering. I remember clomid could have some nasty sides if unlucky.
My exp with gel.
Hmm well i will tell my story as i remember it today, might not correlate with previous posts all that well
will be interesting to c.
I came off propecia because i ran out of pills. I was feeling really good as i remember it for 2-3 weeks. Just as im bout to get my new prescription things turn bad. I had low libido and weak erections while on propecia but nothing major.
Now i find myself getting extremely hard erections (hurt) vains popping out on genitals and beeing very hard to the touch, narrow slightly bent penis etc. Hurting balls. Always tired, fatigued. Could no longer hold my job as a bikemessenger, i tried but my body couldent. I was extremely fit b4 this, a couple of month in i lost 20 pounds (not fat) looked terrible, felt like i aged 10 years in a couple of months. Horrific prostate pains and bloated cramping belly. Had all the usual sides except brainfog. Thank god i was saved from that one as i fear thats the worst of all propecia sides.
About 6 month off propecia im better but (most of pain in penis and stomach went away) still really bad compared to b4 all this.
I decide to do something about it. I get the tests needed and they reveal i have low t and very low free T (below scale). Also somwhat high thyriod hormones t3 and t4.
I get a prescription for testogel.
Within a couple of hours my libido is really high, prolly more so than ever b4. My penis is normal size again, but still very hard, too hard. But its full atleast and not narrow.
The bad part is i felt very sluggish on the gel. Both in brain and movement. Like everything was in abit of slowmotion. I dident really care that much since i had my libido again. My penis was completely normal within 3 weeks of use with the gel, even flacid size was back to normal.
Sensitiviy was better than normal, i really enjoyed these parts of the gel 
However the downside of itching and small lumps in the chest got me scared. The sluggish feeling grew and was really disturbing. I felt dumber like my brain wasent up to speed, No wonder the docs got as all pegged down as hypocondriacs with all our strange sides from day to day.
My prostate also grew abit to large (or atleast felt that way) so i actually took some saw palmetto to keep it down, that worked well. Ejeculation was more than usual and feeling stronger than even b4 all of propecia sides.
To sum it up:
All sides dissepeared but my stomach that still today has the ocational uprise. I became allergic to gluten during all of this so could be this thats bothering me then and still sometimes.
New sides developed: such as chest pain/lumps, sluggishness brain and body.
The interesting part to me is that my total t and free t basicly dident change when on the gel and was only half of what they are today…
Theory
So the most logical explenatition might also be the correct one. My body is still not producing enough dht even with todays highish t levels. But with gels i did get the dht i needed and then some…
I think i would still be in the same spot today even if i never tried trt. I do however know that just the feeling of knowing i could have a libido again was greatly reasuring to me at the low point so maybe trt gave me some peace of mind. And possibly trt helped with penis issues.
Hope this post can help you evalute what to do. If you have any Q ill gladly help out. My memory is really good again btw 