Inserting title pages without changing layout

I’ve been searching and I don’t think there’s a way to do what I want but thought I’d ask anyway…
I have a 50-page score that I spent a lot of time formatting staff spacing, graphics, etc. I was going to do the title pages last but didn’t realize that adding new blank pages would throw off all of my staff spacing because it’s attached to the page. Rather than reformat 50 pages, I think it will be easiest to just create the front matter in a new document. Is there any other way that I’m overlooking?

No, not at the moment. Your best bet is to export the PDF to another program to make the front matter.