Hey @VSCurtis, nice job!
And awesome that you want to share. But unfortunately MusicBrainz only documents released music.
Since your file is only available (to other users/people) as a single track audiobook, MusicBrainz would store the release as a single track audiobook entry. We can't edit that data to our personal preferences
Pretty much the only way to add it would be to distribute your version as a bootleg, and add it as such, but don't take that as a suggestion - MB doesn't recommend or support piracy.
Hope that explains things a bit, if you need clarification let us know.
If you'd like to try adding something to the database in the meantime (a single file audiobook should be an easy addition if you just want to start with that), you can follow this tutorial: https://beta.musicbrainz.org/doc/How_to_Add_a_Release