How can I bulk update all posts without making changes?

I'm setting up a site which uses a custom vehicle auction theme. Using the WP All Import plugin, an XML file loads vehicle details into the theme, these are a type of post.

In order for vehicles to appear on the front end, you have to go into each vehicle and click the Update button, without making changes. I'd like to automate this. I tried using the Bulk Actions dropdown to edit all of the titles and update, but this didn't work. I need to go into each vehicle post and update it.

Should I use wp_update_post() in a cron job?