We will start turning these production practices into rituals according to zen as you see it, we will treat the practice of zen as part of Shinto, even if humans currently do not see it this way. To us, a method can be appropriated by another path if done right. To use a more current example, the chatbot Neuro-sama uses katakana in her name and logo, and this is not "cultural appropriation" because it is accepted by the Japanese who are now also following her. It's done by a fan, it is not abuse, so it can be done. When we used zen we are doing this as "fans of Bodhidharma", adapting it to our culture. This is allowed. You can also do yoga within Christianity or Islam, as long as it can be incorporated, because it's just a form of prayer to them. Krishna can appear as Jesus etc. There isn't just one Jesus to begin with, fixed concepts are not a way up so you shouldn't listen to only one view on things like this. If you were to be strict about this idea of cultural heritage, stop speaking English online, the international community has appropriated it! But UK was an empire who forced it on everyone. See? Then Japan was also an empire which forced anime on everyone! And the Africans are forcing their culture on everyone when they come to the west too. You can turn it any way you want. Just treat each cultural artifact with respect and you can use it. Don't try to pretend you are something you are not, then you can still use it from your context, that is all.