Andrew,

You can make use the Code Snippet DropDown Menu to achieve this.

You transfer all your template pages to HTML code.

When your clients select any item using the Code Snippet DropDown Menu, the HTML code of the template is sent to the editor.

Another solution is to create a custom button. When your clients click the button, a pop-up window show up. You can create the some thumbnail images for your templates. The clients can select the thumbnail images. When they choose one template, the HTML of the template is sent to the editor.

I hope it helps. If not, please let me know.

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