See [bootstrap.sh] for quickest swupd
package bundle installation.
If you are tricksy you can curl
the raw [bootstrap.sh] file and examine it and then chmod +x bootstrap.sh
and run it yourself.
The bootstrap currently doesn't automatically force you into i3, but if you log out and select your user from the login screen and click the ⚙️ icon and select i3 from the list, then enter your password if you didn't already and login.