I've thought about exactly this a few years back but lacked the technical skills to implement it. there are some great books out there as you mentioned, but even worse are great books with mediocre narration/production. eg, A Song of Ice and Fire on Audible is absolutely horrid. The Martian by Andy Weir is fantastic. Can I transplant Will wheaton or Greg Tremblay into GOT? Can I have multiple characters narrated by different voices?

please revisit it if you can.