This short video from the excellent Geerling Engineering YouTube channel focuses on the AM Radio for Every Vehicle Act:
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>commercial radio can continue with normal programming except for the area specified to be in the Emergency
No receiver supports that, in fact there are no commercially available DRM receivers in pretty much the absolute majority of the countries of there. It’s only on paper. Same is the case with the receivers shown on the DRM site, these are just pictures, it’s not possible to buy them from any major web store.
> the sound quality is not the poor AM quality but is FM standard
It’s nowhere near the FM quality, DRM on HF supports max 30 kbps bitrate, which means lots of digital compression artifacts and generally a very poor quality with lots of distortion. Even the dialup internet in the late 90s could do 56 kbps. DRM even worse than dialup. On the contrary, both AM and FM provide clean audio without any compression.
The alternative is already here already Digital Radio Mondiale
https://youtu.be/5ZHy2odu_X0 shows how commercial radio can continue with normal programming except for the area specified to be in the Emergency. They will get a loud announcement, maps of the affected area and detailed instructions. There can be multiple simultaneous emergencies. There is also conditional access available so that messages can be sent to individual crews or all crews all without cell phone access.
In addition the sound quality is not the poor AM quality but is FM standard including stereo sound
https://www.drm.org/products/car-receivers/
https://www.drm.org/products/desktop-and-portable-radios/
https://www.drm.org/products/mobile-phone-solutions/