Ack, I’m an idiot and confused two things, and maybe didn’t explain clearly enough. My apologies for wasting a bit of your time.
I do have a text field on the option page already, and it already dynamically populates the CPT select field.
One of the parameters of this project is to be able to dynamically populate from the CPT edit page, without needing to go to the options page. Either via a textarea field on the post editor page, or just adding a new option into the select box itself. As you mentioned this might pose a challenge, unless you’ve thought of something else!
Thanks
