My point is those 1000 calls all have to reach the board directly to have a effect. To actually pressure them through call center you'll have to be able to overwhelm their capacity over an extended period of time. That's gonna take, 10,000 calls per day for two weeks?
If 1000 people send the CEO a message on LinkedIn there could be some effect.
Meanwhile, would you consider using some Japanese platform, such as DLsite? I think they are going to at least try to hold, for how much bigger and mainstream their industry is. But I don't know how practical it can be. They were not famous for being user-friendly to foreigners but there seem to be some improvements. If there is a sizable enough wave of immigration it may even entice them to be more open.