Attached is the widget that was discussed in workers/48408 and ancestors (Re: Rewrite of zsh-newuser-install).

There was some discussion as to whether this should or shouldn’t leave the executed commands visible in the terminal and/or history. I tried a version of it that doesn’t put the commands in the buffer but executes them directly and then does zle .reset-prompt, but this can leave the prompt in an incorrect state if the prompt uses precmd hooks. I also tried “manually” running precmd_functions before zle .reset-prompt, but this causes problems when any precmd hook contains code that doesn’t work when executed inside a widget (for example, echoing an escape code that result in a response from the terminal). Therefore, I instead settled on pushing the current line, setting the buffer, and then accepting the line. This seems to me the least likely to break anything, but I’m open to alternatives.