I’ve considered setting something like that up on my main homelab system. Honestly though, I only listen to audiobooks or podcasts on one device: my phone. It has TONS of storage, so I just have it set to automatically download a large queue, The audiobooks are a drop in the bucket next to the huge music library I’ve been packing around and adding to since the iPod days.
…and immediately sues every 911 dispatcher for patent infringement.