Java 8 will be supported until 2032 if you pick the right distro, and that distro comes with zstd in the repos (if not pre-installed).

And if your system is so old that you don't have access to eight-year-old software, I don't see why the rest of the world needs to accommodate you. Sticking with weird and old software is fine, but that comes with the risk of having to deal with everyone else moving on.

Seriously who cares about those who are living in the past? It is on them for not keeping up with the times.