https://www.floppydisk.com/ this is a real website with an actual reputable dealer behind it, or at least it was ten years ago when I bought some 5.25" disks from them, and the website looks exactly the same.

look up youtube videos about the Retrotink 4k and the OSSC, there’s a whole world of technology designed to fix this exact problem

A secure, configurable file-sharing and URL shortening web app written in Rust.

Now I’m not saying I recommend it, but Q-Squared by Peter David discusses exactly this.

It looks like Forkyz (in its current version) reads more than just PUZ files now:

Support new input formats (AM Universal JSON, Exolve, PA Puzzles HTML, Spoonbill, Wall Street Journal JSON, .xd, XWord).

[This page] (https://github.com/doshea/nyt_crosswords) is linked from the Forkyz list of sources page you linked. It was the first one I clicked on, and it is a huge archive of JSON files.

I’m very sorry to hear about your dad, and I hope this can help in some way.

https://trash-guides.info/Prowlarr/prowlarr-setup-flaresolverr/