This AppleScript emulates typing by outputting the contents of the clipboard with a delay between each keystroke.

slowtyping.applescript

(*
    This AppleScript emulates typing by outputting the contents of the clipboard 
    with a delay between each keystroke, making it appear more like actual human typing.
    
    The script retrieves the formatted clipboard contents as plain text and outputs each character 
    as a keystroke with a 0.1 second delay using the `keystroke` and `delay` commands in a `repeat` loop.

    You can adjust the delay time to be shorter or longer by changing the value in the delay command.
*)

-- Get the formatted clipboard contents as plain text
set clipboardText to (get the clipboard as «class utf8») as text

-- Use a repeat loop to iterate over each character in the clipboard text
tell application "System Events"
    repeat with i from 1 to length of clipboardText
        -- Output the current character as a keystroke
        keystroke (character i of clipboardText)
        
        -- Add a delay of 0.1 seconds between each keystroke
        delay 0.1
    end repeat
end tell

To bind this to a keyboard shortcut with built-in OSX utilities you can follow this guide.

http://blog.fosketts.net/2010/08/09/assign-keyboard-shortcut-applescript-automator-service/

Otherwise, you can use a third-party program that lets you set custom hotkeys such as: BetterTouchTool, Keyboard Maestro, or Hammerspoon.

This has been tested with BetterTouchTool.

To preserve line breaks you can omit the «class utf8» as follows.

-- Get the clipboard contents as text
set clipboardText to the clipboard as text