I’ve put up an index of 925 popular wheels in the prototype “nested .data.zip.zst” format. It is at https://w2test.website-us-east-1.linodeobjects.com/ unless I run out of transfer. It is suitable for use as pip install --extra-index-url=https://w2test.website-us-east-1.linodeobjects.com/simple/ [package] but you will need a patched pip from https://github.com/dholth/pip/tree/zstd-wheel
Went from 2.6G originals to 1.5G using zstd -19 -T2.