If everybody had access to getting shulker boxes I don’t think this would be too OP. The fact that all the shulkers in the end have been killed off and the only way to now get the shells needed for the boxes is by eggs is what makes them OP. The only way to get the eggs is to either donate and get them with your donation or buy them off a donator(I don’t think that many donators would want to sell them). This leaves a very large part of the community without them and gives an advantage to the ones who do have them. Personally….if there was a way for non donators to get them I wouldn’t see a problem with it.