Notes:

So yeah, there is an officially licensed 1980s Shonen Jump themed restaurant and bar in Tokyo, Shinjuku, known as the “Adult Jump Bar”
It has an all you can eat buffet, or alternatively you can pay separately for a Shonen Jump themed meal.
Unlimited re-fills on drinks too, and you can get exclusive merch with some of the meals (don't get too excited tho, it is mostly just mugs and plates)