Hi @stijnwizarts
I’m glad to hear that you were able to edit all the options after checking out the Automated taxes option.
A different question maybe, how do I add a suffix to the shipping options in the cart/checkout?
Did you try the price display suffix option? It might help. If not, then you need some custom coding. You can try using the woocommerce_cart_shipping_method_full_label
filter.
Please note that writing or providing custom code is not within the scope of our support policy. If you are still having problems, we recommend asking development questions on the #developers channel of the WooCommerce Community Slack. Many of our developers hang out there and will be able to offer insights into your question. You can also seek help from the following:
I wish I could help more, but hopefully, this gets you going in the right direction to get the job done.