A WARC might have been put into the Wayback Machine; do a search there for the url. Failing that, there are proxies you can run locally that let you access the content of a WARC as if you were browsing the original site. https://github.com/internetarchive/warcprox is even by IA themselves, so clearly they're working on it.
A viewer that let you browse the contents of a WARC the same way you can do for a zip would be really nice, but it's probably a separate project from redesigning the site. In fact, browsing zip files (and a bunch of other similar file types, of course) was added only a few months ago.
True, the WARC file might have been included in the Wayback Machine, but I meant something different. I'm specifically interested in the ability to specify which WARC file I want to play back. I think an example would be better than me trying to explain it. Have a look at https://webrecorder.io, it lets you play back any WARC or ARC file, you just have to provide the URL.
I know this is outside the realm of a redesign, but if IA could add something like this, it would be a big UX improvement.
A viewer that let you browse the contents of a WARC the same way you can do for a zip would be really nice, but it's probably a separate project from redesigning the site. In fact, browsing zip files (and a bunch of other similar file types, of course) was added only a few months ago.