I am looking to use post meta data as a set of options for a radio field, but metabox registration happens to early in the WP execution order to know which post is being edited. I would assume there is a way to filter this after the fact before it is displayed, but I've been searching two hours and coming up blank.
I *think* I have something here with rwmb_get_registry( 'field' ), but I am only seeing getter methods in the docs and I need to set. Thoughts? Gentle push in the general right direction?
According to that answer it's not possible, which is a major flaw in the system IMHO. You have a registry and storage, why can't that registry be tweaked at any point?
Unfortunately, I am behind on this project so I am reticent to abandon metabox for another solution at this juncture. I may have to write a custom plugin with it's own form handing to make this one small bit work and that chafes.