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Oh, ok so that was only a 10⁹ times more... No biggie. LOL.
Anyway, as long as you're able to sleep well, it should be ok. Personally, I think 2 cups (2*200 ml) is a good amount for me. The exact amount of caffeine that contains depends on the type of coffee beans I use. The concentration in the drinkable liquid should be around 300 mg/l, but who knows really. Dark roast will have less than light roast. In any case, that could be something like 2cups/d *0.2 l/cup *300 mg/l = 120 mg/d. Compared to that, I would still say your caffeine intake is a lot higher than mine.
Anyway, as a fun thought experiment, I looked up what caffeine costs and what it would take to buy 400 Mg of it. Sigma-Aldrich/Merck sells 25 kg drums of this stuff and they charge only 1060 € for each. What a bargain for food grade caffeine!
That means, you would need to order 16 000 drums of it. That will be quite a few pallets. Is that going to be more than a single lorry? Don't worry about it. It will cost you only 16 960 000 €, so I guess now would be a good time to start a company to get those tax deductions on chemical orders. On the other hand, you might actually want to contact one of the many factories that produce decaf beans and ask for a better price. All of that caffeine has to go somewhere, right?
Usually, I would recommend using gloves, respirator, full hazmat suit etc. when handling this kind of cargo, but in this case that would kinda defeat the purpose.
source: https://www.sigmaaldrich.com/DE/en/product/aldrich/w222402