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Registry Proxy Cache instead of registry migration

Till now our group uses docker_registry v1 without security (s3 based, about 7TB) .
currently we have issue connected with pull request timeout , as the registry’s images count becomes more than 7K. We have planed to start new registry (v2) and migrate only actual images. But no guaranty for now that we can filtering correctly, to migrate only useful images. Also we dont want to migrate all images.
Is there a way to start new registry (v2) which will be also proxy_cache of old registry (v1) ?
I have already tried this article’s points without success.