Changing post/page title

I’m wanting (for complicated reasons) to dynamically change an individual Post/Page title (for front-end browser display purposes only, not in DB).

However, for reasons, I need to do this on the fly within the actual post content using PHP-Exec plugin (so I can do PHP) and WP hooks/actions etc.

Is this even possible? If so, how? ??

Hoping this makes sense.

Thx