Thanks Paul, happy to be a beta tester of Cross-doc Plus if you have the need for that.
On the topic of page sharing, I don’t want to hijack this thread but I have a strong view that as a community we’re going about this backwards. We should leave secure data sharing to Cross-doc (and Cross-doc Plus 
) and just push for Doc Locking on steroids for within a single doc.
Think of a “Hide if” option for each page that takes a formula, a similar “Disable If” option for columns that makes them read-only, and so on. Doc sharing remains unchanged, so we keep the working principle that sharing a doc with someone means they can see everything if they are motivated. But it gives us makers the tool to make more user-specific ux from within a single doc.
I ramble on a bit about it here if you’re bored: