Thank you so much again for pointing us to the second template, @Rachel!
I can confirm that we have now switched to the EU template and it looks much better! 
So the only requirement still open is now what you have described in your last paragraph:
The total amount excluding taxes per tax rate. See (1) in the modified example below again.
(2) has a workaround but would still be nice to have it automated for a simplified setup.
