Add One-Click Empty buttons via Shortcake by adding 'add_button' => true when registering Shortcode UI arguments -- can also use 'add_button' => 'icon_only' -- requires https://wordpress.org/plugins/shortcode-ui/ be installed and activated

shortcode_ui_editor_one_click_insert_buttons.php

<?php

add_action( 'media_buttons', 'shortcode_ui_editor_one_click_insert_buttons', 200 ); // higher priority adds it to the right side of all the other buttons (Add Media, Gravity Forms, etc.)

	// adapted from https://github.com/fusioneng/Shortcake/issues/94#issuecomment-68020127
	function shortcode_ui_editor_one_click_insert_buttons( $editor_id = '' ) { // without $editor_id = '', 'content' gets printed before the button
		
		// Check if Shortcake is installed and activated
		if( ! method_exists( 'Shortcode_UI', 'get_instance' ) ) {
			return false;
		}
		
		// Get all registered UI shortcodes
		$ui_shortcodes = Shortcode_UI::get_instance()->get_shortcodes();
		if( empty( $ui_shortcodes ) ) {
			return false;
		}
		
		wp_enqueue_script( 'jquery' ); // if not already, we need it
		
		// Initialize
		$html = '';
		$script = '';
		
		// Add Button and jQuery for each UI shortcode with add_button attribute
		// to display only an icon:
			// 'add_button'	 => 'icon_only',
		// to display icon + label:
			// 'add_button'	 => 'yea',
			// anything that passes the empty() check
		foreach ( $ui_shortcodes as $shortcode => $atts ) {
		
			// Skip if add_button attribute isn't set
			if ( empty( $atts['add_button'] ) ) {
				continue;
			}
			
			$label = ' Insert ' . $atts['label'];
			if ( 'icon_only' == $atts['add_button'] ) {
				$label = '';
			}
						
			// If shortcode has an inner_content attribute (e.g. single shortcode [button] vs [button][/button])
			$enclosed_shortcode_tail = '';
			if ( isset( $atts['inner_content'] ) ) {
				$enclosed_shortcode_tail = sprintf( '[/%s]', $shortcode );
			}
			
			// Compile button HTML
			$html .= sprintf( '<a href="#" id="insert-%1$s-button" class="button insert-%1$s add-%1$s" data-editor="content" title="Insert %2$s"><span class="dashicons wp-media-buttons-icon %3$s"></span>%4$s</a>',
				$shortcode,
				$atts['label'],
				$atts['listItemImage'],
				$label
			);
			
			// Build shortcode will all possible attributes set to ""
			$att_markup = array();
			$has_content_att = false;
			
			foreach( $atts['attrs'] as $att_array ) {
				$att_markup[] = $att_array['attr'] . '=""';	// notice double-quotes
			} // end foreach
			
			// notice escaped single-quotes in send_to_editor -- they are required, else JS console error and will not insert into Editor
			$script .= sprintf( 'jQuery("#insert-%1$s-button").on("click", function() {
				window.parent.send_to_editor(\'[%1$s %2$s]%3$s\');
				});',
				$shortcode,
				implode( ' ', $att_markup ),
				$enclosed_shortcode_tail
			);
		} // end foreach
		
		$script = sprintf( '<script>%s</script>', $script );
		
		$html .= $script;
		
		echo $html;
	}