Have you considered GrapheneOS? Not an open source phone as you say, but it is at least open source software, running on hardware with published specs. It should be capable of everything you want.

If anyone says anything is “a surefire way to make money”, they are looking for a Greater Fool on which to unload their position so they can actually make the money.

The Aeropress should be fine. The Hario grinder is not good, but produces an OK grind, it just takes forever. Since you want to taste the unique coffee, go middle of the range on recipe: water temperature, 200F/93C, your choice of 9g for a half cup seems spot on. Personally, I’d do pour over instead, but since you have one shot, go with the technique you are most familiar with.

I’d be really interested to know if the stuff is any good.

I do believe blooming is good, the first pour should be gentle and get the grounds wet, and the second pour should be from higher up, to agitate the grounds. There are probably other ways to get the same results. People tend to mess around with whatever techniques they can, do something that makes a better cup, and settle on that as the way to do it. There’s more than one good way.

You say that like it’s a bad thing…

Q-Tips. Paper shafts, plenty of fuzz on the ends.

In a bag with charger and other accessories. Don’t recall actually using it more than once. Paper clips are the traditional solution.