On second thought, a utility isn't needed for this

See a2c0141d8

includes/functions.php

@@ -8,16 +8,3 @@ namespace WP_Cron_Control_Revisited;
 function get_plugin_var( $variable ) {
 	return property_exists( Main::instance(), $variable ) ? Main::instance()->$variable : null;
 }
-
-/**
- * Delete an event
- *
- * @param $timestamp  int     Unix timestamp
- * @param $action     string  name of action used when the event is registered (unhashed)
- * @param $instance   string  md5 hash of the event's arguments array, which Core uses to index the `cron` option
- *
- * @return bool
- */
-function delete_cron_event( $timestamp, $action, $instance ) {
-	return Cron_Options_CPT::instance()->delete_event( $timestamp, $action, $instance );
-}

wp-cron-control-revisited.php

@@ -248,7 +248,7 @@ class Main {
 		}
 
 		wp_unschedule_event( $event['timestamp'], $event['action'], $event['args'] );
-		delete_cron_event( $event['timestamp'], $event['action'], $event['instance'] );
+		Cron_Options_CPT::instance()->delete_event( $event['timestamp'], $event['action'], $event['instance'] );
 
 		// Run the event
 		do_action_ref_array( $event['action'], $event['args'] );