Use a static site generator plugin for Wordpress, host it completely behind IP restrictions or firewall rules, for only whoever needs to actually update it. The static site plugin will regenerate/update plain HTML files out of your WP instance whenever you tell it to; then it transfers those to your location of choice where they’ll just be hosted statically.
Wordpress is a pile of garbage from a security standpoint and having it exposed to the internet is basically asking to be hacked constantly by spammers and script kiddies. But it is useful as an easy content generation tool anyone can use, and at the cadence most people actually update it, the regeneration compute time is trivial.