I just saw this in a Youtube video, not sure if anyone has mentioned this yet, but here is the scoop on the return of the Kindle Assistive Reader to the Alexa app. Apparently it returned with a recent FW update.
- On your device (smartphone, tablet, etc.) open the Alexa app.
- Select to go to the Play page and scroll down to see the Kindle Library section.
- It might prompt you to turn on the Kindle Assistive Reader feature. If not, go to More —> Settings —> Accessibility —> Kindle Assistive Reader and toggle it on.
Once turned on in any Alexa app on one of your devices it will be enabled on all the devices with the same Alexa account. Now return to the Play page and scroll down to see the Kindle Library section and select a book. You will get a screen asking on which device to play the Kindle Assistive Reader. There is an option for Everywhere. It seems to work, but I haven’t tested it extensively.
ETA: Okay it is bit kluge on pausing until you get the feel for it, but it does work well so for. I’ve tested it on my Echo Plus and iPhone 13 Pro Max so far, and it sounds good!