Thanks for your suggestion John, but that would require me to know all possible field names in advance (so I could hide/show the correct one conditionally). There are infinite possibilities in my case.
What about using acf_update_field to write the field to the database? From includes/api-field.php:
/*
* acf_update_field
*
* This function will update a field into the DB.
* The returned field will always contain an ID
*
* @type function
* @date 1/10/13
* @since 5.0.0
*
* @param $field (array)
* @return $field (array)
*/
function acf_update_field( $field = false, $specific = false )
I could construct a field object and call this function perhaps?
