I am also waiting for a 15.1 full installer. It's really annoying.
Here is a good oversight if one is available, without logging in to a Dev. account or search in the AppStore:
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macOS Sequoia Full Installer Database. Download Directly from Apple!
Download macOS Sequoia full installer with one click straight from Apple! Every version of Sequoia Beta & Final available all in one place!!mrmacintosh.com
So there is no way to do a clean install of the RC as of now until Apple releases the installer?