[Mister L]

Originally Posted by Doitsu

There's a dedicated tool for this task that you might find helpful. Print Page Approximator for EPUB and EPUB3
(The author is an MR member.)
If you happen to have a Kindle, the Calibre KFX output plugin also supports auto-generated page numbers.

It looks like Page Approximator will do exactly what I need. Thank you again Doitsu!