I thought of trying to get a sympathetic person from librivox (public domain audio-book recordings) to do it, but it might be tricky to advertise, because the project is very clear about not using copyrighted materials. We could try DM-ing people individually.
Another option, after searching around I found there are people who do audio books for fanfiction: https://archiveofourown.org/tags/Audio Book/works. We could find one with a decent voice and mic, and reach out to the person.