I'm saying all this based on you seemingly looking for a drug that can help you overcome sober limitations that impede what you believe would lead to the most sustained happiness. That doesn't necessarily have to be the zeitgeist's superego's goals at all, and you probably should take those with more than a grain of salt. Even if they work for some people, you should really think about what you want before chasing them as if they're a guaranteed recipe to feelings of happiness and fulfillment.

Properly dosed oral 2-FMA seems to be the closest drug to what you describe wanting, and the only one that I've tried or read about that comes even close. Its effects are extremely different from any stim I've ever read about or tried, and I am no stranger to stims, especially ones that are spuriously similar to 2-FMA.

The other stims can be productive, and can be very fun, but they are drugs that feel very drug-like and compulsive, whether you're doing them productively or for fun, and which overrun and take over, creating their own unique feelings and situations that are not balanced at all. To put it simply, when you're high you're high, and when you crash you crash, and it's mostly up to the drug, not you. The changes are that major and imbalanced.

2-FMA creates a much more balanced feel, so much so that you really should be careful with it just because it does feel so genuine and natural, not to mention the unstudied nature of its effects in the short and long term. But it's definitely the only stim I've ever been on that allowed me to much more reliably DIRECT my focus while also increasing motivation and making mundane tasks more pleasurable. All the rest of them are just obsessive.