With the footnote separation line and page numbers, the student could skip over the footnotes if they wanted.
If you split them, how will the student know which volume has the appropriate note in it? You would have to have very specific TN's on the TN pages. My recommendation would be to braille all of the text in volumes 1-15 (say) and then the notes in 16-30 (or whatever) and then include TN's in the text volumes letting them know which volume(s) have the appropriate notes.
I have done a book very similar to what you have there (it was Hamlet I think) and we did combined pages.