This is the sort of fundamental misunderstanding of data protection laws that makes me quite irritated.
We all know our backer number, we all have a choice if we want to share that information so people can tie our backer number to our user account here. We also have a choice if we want to expose any personally identifiable information in our user account. Our backer number is not personally identifiable information though - it’s not a phone number and it’s not an email address. What I am suggesting is that you post a list like this:
1234,2252,2325,6464,3232,5454 → Shipped to Germany, ETA 31st October 2019
That information exposes no personally identifiable information about me or anyone else so is not in scope for data protection but it does allow me to see where and when I am likely to get a projector and to raise it with you if I have been forgotten again.
Stop hiding behind data protection myths.