the fs module that fontTools.ufoLib uses to implement .ufoz (UFO inside a .zip file) hasn't received an update in more than 2 years, it's basically unmaintained, see: PyFilesystem/pyfilesystem2#571

There is a new module called https://github.com/fsspec/filesystem_spec which may be a suitable replacement and is more actively maintained. Maybe we should try to use that.
It does have a ZipFileSystem implementation:
https://github.com/fsspec/filesystem_spec/blob/master/fsspec/implementations/zip.py

Or alternatively we could reimplement our own filesystem-like wrapper around a zip file.

I'd prefer option 1), or whichever is easier.