Turns out I was making it more complicated than it needed to be. This did the trick:
$user_query = new WP_User_Query( array( 'role' => 'Member', 'meta_key' => 'last_name', 'orderby' => 'meta_value', 'order' => 'ASC', 'meta_query' => array( array( 'key' => 'publish_publically', 'value' => true ), array( 'key' => 'sector', 'value' => $_POST['sector-select'], 'compare' => 'LIKE' ) ) ) );
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