Not sure if I understand what you mean. Is this for cases like “à ultima da hora”? If so, I will add later the exception.
I will fix this and extend some of your rules that are already good. I have already planned a batch of other additions, and that will come in the proper order.
Yes, Portuguese people (popular expression) usually say “à última da hora” but I read in the grammar books that it is “à última hora”, so, by adding an exception “última” it would fix this rule and other possible issues.