Microdosing finasteride, does it work?

Hey! I’m (just turning) 20 years old and after lots of deliberation, have decided to start using finasteride. However for my own ease and peace of mind, I’ve decided I want to start by tapering up on finasteride, and track my progress to find the minimum DHT block necessary to maintain my hair (my recession isn’t objectively that bad, but I’ve recently started receding and thinning again, so I want to maintain it here). I’ve noticed that there are more than a few people who’ve decided to dissolve finasteride in alcohol but I’d like to know if there’s any disadvantage to grinding finasteride into fine powder and using empty gelatin capsules to store them and take them?

That makes no sense. If you want to gradually increase the dose, you can start off taking one pill a week, then increase it to two, then three, then four until you get to one a day.  To see value, finasteride takes almost a year for 80% of the results to show up. Doing what you are suggesting may make the medication have no value.