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A function to display message under the prompt without zle active

I've forged as I think an interesting function, which will display
given message under the prompt regardless if ran from within zle or
not. It uses the exec <(...) / zle -F trick to dispatch a callback
that does have the zle active (zle -F -w isn't needed, zle -M works
fine from no-widget callback):

# deploy-message Hello world
# deploy-message @sleep:5.5 "Hello world"
deploy-message() {
    [[ "$1" = <-> && ${#} -eq 1 ]] && { zle && {
            local alltext text IFS=$'\n' nl=$'\n'
            repeat 25; do read -u"$1" text; alltext+="${text:+$text$nl}"; done
            [[ -n "$alltext" ]] && zle -M "$alltext"
        zle -F "$1"; exec {1}<&-
        return 0
    local THEFD
    # The expansion is: if there is @sleep: pfx, then use what's after
    # it, otherwise substitute 0
    exec {THEFD} < <(LANG=C sleep $(( 0.01 +
${${${(M)1#@sleep:}:+${1#@sleep:}}:-0} )); print -r --
${1:#(@msg|@sleep:*)} "${@[2,-1]}")
    zle -F "$THEFD" -deploy-message

There's a gist with the function as well, in case of any updates:
Sebastian Gniazdowski
News: https://twitter.com/ZdharmaI
IRC: https://kiwiirc.com/client/chat.freenode.net:+6697/#zplugin
Blog: http://zdharma.org

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