Built off Matt's version (https://gist.github.com/mattallan/e45730807e019343edbf) as a base, this version just includes a log mode and a db rollback in case something goes wrong.

reset-next-payment.php

<?php
/**
 * Plugin Name: Prospress Script - Reset next payment dates
 * Description: A custom plugin for Phoebe's site that will reset all the next payment dates and push them back 1 minute.
 * Author: Matt Allan - Prospress Inc.
 * Author URI: http://prospress.com/
 * Version: 1.0
 */

function reset_next_payment_dates() {
	global $wpdb;

	$logger = new WC_Logger();

	if ( isset( $_GET['log_next_payment_dates'] ) || isset( $_GET['update_next_payment_dates'] ) ) {

		$mode = ( isset( $_GET['log_next_payment_dates'] ) ) ? 'log' : 'update';

		if ( isset( $_GET['clear'] ) ) {
			delete_option( '_wcs_subscriptions_next_payment_dates_' . $mode );
			$logger->clear( 'timezone-next-payment-date-fixer' );
		}

		if ( ! isset( $_GET['continue'] ) ) {
			$logger->add( 'timezone-next-payment-date-fixer', 'Reset next payment dates started in: ' . $mode . ' mode' );
		}

		// get all active subscriptions
		$subscription_ids = get_posts( array(
				'post_status'    => 'wc-active',
				'post_type'      => 'shop_subscription',
				'posts_per_page' => '-1',
				'fields'         => 'ids',
			)
		);
		$updated_subscriptions = get_option( '_wcs_subscriptions_next_payment_dates_' . $mode , array() );

		$counter = 0;
		foreach ( $subscription_ids as $subscription_id ) {

			if ( $counter >= 10 ) {
				break;
			}

			if ( in_array( $subscription_id, $updated_subscriptions ) ) {
				continue;
			}

			try {
				$subscription = wcs_get_subscription( $subscription_id );
				$next_payment = $subscription->get_time( 'next_payment' );
				$counter++;

				$updated_subscriptions[] = $subscription_id;
				update_option( '_wcs_subscriptions_next_payment_dates_' . $mode, $updated_subscriptions );

				if ( $subscription->can_date_be_updated( 'next_payment' ) && $next_payment != 0 ) {

					$new_next_payment = gmdate( 'Y-m-d H:i:s', $next_payment + 60 ); // add one minute
					$logger->add( 'timezone-next-payment-date-fixer', 'updating subscription: ' . $subscription_id . ' from ' . gmdate( 'Y-m-d H:i:s', $next_payment ) . ' to ' . $new_next_payment ); // log any issues with updating

					if ( 'update' == $mode ) {
						// In case something bad happens start a transaction, commit and rollback structure
						$wpdb->query( 'START TRANSACTION' );

						$subscription->update_dates( array( 'next_payment' => $new_next_payment ) );

						// Everything seems to be in order
						if ( isset( $_GET['rollback'] ) ) {
							$wpdb->query( 'ROLLBACK' );
						} else {
							$wpdb->query( 'COMMIT' );
						}

					}

				}

			} catch( Exception $e ) {
				$logger->add( 'timezone-next-payment-date-fixer', 'FAILED updating ' . $subscription_id . ' error: ' . print_r( $e->getMessage(), true ) ); // log any issues with updating

				$wpdb->query( 'ROLLBACK' );

				$updated_subscriptions[] = $subscription_id;
				update_option( '_wcs_subscriptions_next_payment_dates_' . $mode, $updated_subscriptions );
			}
		}

		if ( count( $subscription_ids ) == count( $updated_subscriptions ) ) {

			$logger->add( 'timezone-next-payment-date-fixer', 'UPDATER FINISHED' );

			if ( isset( $_GET['rollback'] ) ) {
				delete_option( '_wcs_subscriptions_next_payment_dates_' . $mode );
			}

			wp_safe_redirect( remove_query_arg( array( 'log_next_payment_dates', 'update_next_payment_dates' ) ) );
			exit;
		} else {

			$args = $_GET;
			unset($args['clear']);
			$args['continue'] = true;

			wp_safe_redirect( add_query_arg( $args, admin_url( 'admin.php' ) ) );
			exit;
		}
	}
}
add_action( 'init', 'reset_next_payment_dates' );

function rnp_plugin_actions( $links ) {

	$args = array(
		'page' => 'wc-status',
		'tab' => 'logs',
	);

	return array_merge( $links, array(
		'<a href="' . add_query_arg( array_merge( $args, array( 'clear' => true, 'log_next_payment_dates' => true ) ), admin_url( 'admin.php' ) ) . '">' . __( 'Log the reset (does not update anything)' ) . '</a>',
		'<a href="' . add_query_arg( array_merge( $args, array( 'rollback' => true, 'clear' => true, 'update_next_payment_dates' => true ) ), admin_url( 'admin.php' ) ) . '">' . __( 'Reset and rollback' ) . '</a>',
		'<a href="' . add_query_arg( array_merge( $args, array( 'update_next_payment_dates' => true ) ), admin_url( 'admin.php' ) ) . '">' . __( 'RESET THE NEXT PAYMENT DATES!' ) . '</a>',
	));

}
add_filter( 'plugin_action_links_' . plugin_basename( __FILE__ ), 'rnp_plugin_actions' );