FWIW, I did create a Ventura bootable installer "successfully" on my M1 MacBook Air. However, it does not show up in Startup Disk or Options, so I can't boot from it. I seem to remember something about booting from an external may be disabled during beta testing but I don't know that for sure.

Check compatibility near the bottom of the page. https://www.apple.com/macos/macos-ventura-preview/

Fixed. Had to log out of the App Store on all 4 Macs and re-log in. No idea why.

I don't have the mouse however, from the Release Notes for 12.3… "Some third-party keyboards and mice might encounter issues when using additional functionality, like scroll wheels. (88106362)".