For anyone searching and reading this later, I already fixed the first problem myself by adding the following snippet to my child theme’s functions.php file:

add_action( ‘woocommerce_after_shop_loop_item_title’, ‘my_add_short_description’, 9 );
function my_add_short_description() {
echo ‘<span class=”title-description”>’ . the_excerpt() . ‘</span><br />’;
}

Any help with the second issue would still be greatly appreciated :).