You can do it. Totally non Bubble way though. Pure HTML and JS.
It looks like you are using HTML element to format the signature, which is good. You can add some javascript magic to copy this if you assign an ID to the main table in the HTML element. Then, you can call the following function on a button click on the page (HTML again) and copy the table. See the demo below:
And here is the function I added:
And this is the ID of the table and a button that calls the function above:
You can analyze it here: