If you have enough available storage on your system disk, you can set up dual booting to take macOS Sequoia for a spin. Here's a very good reference video: https://www.youtube.com/watch?v=xzUPFeat9U4 Otherwise, one can use an external SSD or flash drive. Just remember to perform a TimeMachine backup before attempting any of these solutions.

After a bit of research, it appears that one can run via the iOS simulator but one will receive errors when trying to run via My Mac or Xcode Previews.

Yes, I also noticed that the shell is hanging in macOS Big Sur Beta 1 and 2. In macOS Big Sur Beta 2, I was able to resolve this issue by switching from my MacPorts back to the Apple's version of Zsh by doing the following: 1) In Terminal app, changed preferences for Shells Open with to the following: /bin/zsh Note: The above didn't work for me using macOS Big Sur Beta 1. 2) In the command line, performed the following for consistency: chsh -s /bin/zsh Well, I wish that this helps both you as well as others get past this issue.