Creating “static” taxonomies to choose from, inside custom post type?

Make it show_ui => false

Then to show it on the post edit screen add the box manually

add_action('add_meta_boxes', 'meta_boxes_function');

function meta_boxes_function() {
     add_meta_box('categoriesdiv', 'categories', 'post_categories_meta_box', 'blurb', 'side', null, array('taxonomy' => 'categories'));
}

use this code for every static term

if(!term_exists('term1', 'categories'))
    wp_insert_term('term1', 'categories');