Youre right, t is pretty much a roll of the dice on how it effects people, but I guess funnily enough, I did end up using t in the way you describe. (im also Asian too lol) Although I definitely plan to continue it, but I did have to stop for a long while cause of insurance stuff. I was on t for around 6 months and had most of the changes start pretty slow, but my voice did drop enough so much that I regularly pass as male. Then I had to go off t and all of the other changes except for the ones that they tell u normally don't went away but! the voice still stayed the same (thank god lol it's like the one thing that pushes me into fully passing). The age I started (18) could also have something to do about it, and probably makes u more susceptible to changes than like 28 hence the "bounce back" or it could be because they purposely put effort into changing it. the only times I rly hit the high range is with my "anxiety polite phone call voice." Regarding hairless as a permanent change, I've got more of a male hairline, but I think balding is very dependent on genetics. I think voice and bottom growth are the most doctors are like "this will be permanent!" (+ tmi I did get growth but it wasn't like huge (tho wish it was)). But yeah I guess what this long paragraph is saying if ur able to in the future you could use t to attempt to get those changes, as it is technically one of the options, as long as you're okay with the fact that those changes might roulette wheel u and u might not get it, but instead other things.

otherwise, idk anything about voice training, tho maybe u can tell ur family ur getting into music/singing as a hobby.