Sumifs wild card dealing with blamks

Hi all,
I have searched and searched to try and resolve this problem.
I am trying to create a series of sumifs formulas that the criteria is set upon the result of a number of drop down selections.
Now the issue I have is some of the ranges have numbers and some will have blanks.

I have attached a sample work book.
I have got over the issue of numbers by changing the numbers to text ie 1 is now one

But the problem I have is say column A has either Y, N or blanks.
I may wish to sumifs if either Y or N - no problem.
But what if I want to select ALL
using * will still only sum those with Y or N in the column but not ""
I only want the 1 formula and not 2 ie: sumif ">" + sumif ""

any suggestions?