Hiding SSAS Attributes with PowerShell

The challenge here was that we have a cube with some great data as well as some low level detail (customer detail, think PII) that we want to expose to a larger audience. The problem is that the low level detail is not something that the new audience needs (or in some cases, is allowed) to have access to. The obvious answer here is Dimension security - why not use that? Two reasons. First, Dimension security is slow. Second, even if it wasn't slow, to hide all the data in many (30+) attributes is tedious to setup, and when new attributes were added we would have to make sure and disable access to those as well. To be clear, we're not just hiding attributes here, we're creating an entire copy of the existing SSAS database and hiding attributes in the copy.