Thanks for the suggestion, Danny.
If you’re on the delivery, there should be a View order button in the top-right which can take you directly to the order (and save a few clicks).
Additionally, you can schedule these emails to be sent automatically and save yourself all the clicks! In Settings → Order/invoice settings you should see an option like this:
You can exclude a subset of customers from these automatic emails too (if needed). You can see more on this at How can I specify which customer email addresses will receive invoice/delivery note emails
Does this cover what you need or would it still be helpful to have the button that you’ve suggested?
Thank you.