It might help users to be pointed in the direction of bio2zarr for VCF conversion, but I guess there will be some slight incompatibilities between scikit-allel's VCF data model and the VCF Zarr Spec. Perhaps a quick recipe on how to use data in VCZ with scikit-allel could be provided?
I think people are going to be using scikit-allel for the foreseeable future (regardless of sgkit's status) so this would be a good bridge to build.
See the preprint for more details and background