In my opinion, developers should have thought of their users and just implemented in the EasyAR 2 system the option to save using ARM64.
Please do this developers. So, this will not cause headaches, allowing users to migrate to the new version later, creating totally new projects ... Would not it be much simpler?
I think there is a risk of losing clients / users, who may migrate, not to EasyAr 3, but to other plugins like Vuforia ...
Please think about this developers ...