Minoxidil can definitely give a lot of regrowth, especially when you’re on HRT so there’s a lot less DHT in your system to fuck with the regrowth effects of it. However, there are some drawbacks. A big one is that even topical minoxidil frequently causes increased body hair growth which is generally undesirable for trans women. It won’t turn you into a hurry werewolf overnight so you could do it, see how it works for you, then stop. Similarly due to the lack of DHT in your system, the consequences for going off it are significantly less than with a cis man.
I haven’t personally used minoxidil but that’s the information I’ve gathered over time from people I know and things I’ve read online.
I have, however, used finasteride and oh boy let me tell you I fuckin love it. I ended up getting hair transplants to fill in my temples anyway but I was seeing regrowth in the corners, just slower than what I wanted for my transition timeline. It was also helpful for some unfortunate density issues I had on my crown but the very best thing it did for me, or at least likely had a part in, was decreased body hair. I used to grow this wiry gross hair on my shoulders and it just stopped entirely after a few months on HRT and finasteride. I know HRT slows body hair growth over time but this was super fast so I generally attribute it to the finasteride.
It’s also worth noting that unless your temples are quite receded, it’s actually surprisingly common that cis women have sharp temple corners of their own. Dysphoria doesn’t always care about that though so it’s up to you how you feel about it in the end. I know plenty of trans girls that didn’t and still don’t give a fuck and look amazing (and pass, since that’s something they care about) and I definitely would have also passed just fine without it but my dysphoria just didn’t care and couldn’t accept it as it was.