Please provide lab ranges as your numbers have little meaning as every lab has its own ranges as there is no standards.
Start TRT in isolation and dial in, then if you want HCG add it and see how you tolerate it. An SHBG of 4.6 is not good, TRT likely won’t even work for you as you aren’t binding testosterone to SHBG. SHBG is a protein that binds tightly to the hormones testosterone, DHT, and estradiol.
Testosterone binds to SHBG and you have almost none, so testosterone is secreted into the urine and is why testosterone is low. Hypothyroidism can explain low SHBG, if Free T3 is low or Reverse T3 is high, that would slow down the liver production of SHBG.
Sometime SHBG is just low do to genetics. If you target a high Total T, you will have a ton of free estrogen which tends to be very high in low SHBG men, therefore a Total T of under 300 is recommended as a starting point unless hypothyroidism can explain low SHBG.
The majority of men do not absorb T-Gel, you may need to go private as the majority of doctors are TRT ignorant, injections everyday is needed or your results will be largely negative.
Excess carbs, sugars lowers SHBG, a mediterranean diet is recommended for low SHBG men and will add years to your life.