[NTG-context] Best practices for multi-part book

Hi, I need to typeset a book that, due to space constraints, is going to be published in two volumes. Both volumes together will contain about 1500 pages, both volumes should be continuously paginated, i.e. if volume 1 ends at page 700 volume 2 will start at 801 (After the frontmatter maybe.) Both volumes will have the same frontmatter, maybe a different subtitle. Oh, and of course, both volumes shall have a complete table of contents. How would you approach such a task. I'm inclined to just treat the the whole thing as a single book, and split the the PDF at some point. Or, are there better ways that I could consider? Best, Denis