Disable button for 5 seconds with different label and change after it

I’m trying to create an intro in my shiny app using the rintrojs package with the introjs function. My goal is to create an intro where the first next button is disabled for 5 seconds and has a different label like ‘Wait 5 seconds…’. It currently waits 5 seconds and changes from label but it isn’t disabled during the 5 seconds. So you can still click on it. Here is a reproducible example:

library(shiny)
library(rintrojs)

ui <- fluidPage(
  introjsUI(),
  actionButton("start_intro", "Start Intro"),
  h1("Welcome to the Shiny App"),
  p("This is some description of the app.")
)

server <- function(input, output, session) {
  
  steps <- reactive({
    data.frame(
      element = c(NA, "#start_intro"),
      intro = c("Welcome to the app! This first step has a custom button.",
                "This is the start button for the intro tour."),
      position = c("bottom", "bottom")
    )
  })
  
  observeEvent(input$start_intro, {
    introjs(session, 
            options = list(
              steps = steps(),
              nextLabel = "Wait 5 seconds..." 
            ),
            events = list(
              "onbeforechange" = I("
                if (this._currentStep === 0) {
                  var that = this;
                  var nextButton = document.querySelector('.introjs-nextbutton');
                  
                  if (nextButton) {
                    nextButton.innerHTML = 'Wait 5 seconds...';  // Initial label
                    nextButton.disabled = true;                  // Disable the button
                  }
                  
                  setTimeout(function() {
                    that._options.nextLabel = 'next'; // Change label after 5 seconds
                    that._introItems[0].nextLabel = 'next';
                    var nextButton = document.querySelector('.introjs-nextbutton');
                    if (nextButton) {
                      nextButton.innerHTML = 'next';  // Update the label to 'next'
                      nextButton.disabled = false;    // Enable the button after 5 seconds
                    }
                  }, 5000); // 5 seconds delay
                }
              ")
            )
    )
  })
}
 
shinyApp(ui = ui, server = server)

Output:

As you can see it create the ‘Wait 5 seconds…’ button which is also shown for 5 seconds, but it is not disabled during the 5 seconds. So I was wondering how we can create a button which changes from label after 5 seconds and is disabled during the 5 seconds?