I can't see how you could do it without introducing a helper column. My attempt would be to list the items that meet your criteria in a column, I've used column F which has an array formula to pull through all values that meet the criteria, then in column G a count of the unique. Is this close to what you need? I had already made up my sample before you posted, i'm sure you can adapt to meet your layout. If it's just the count you need then you can hide column F
I've added some CF to make it easier to look at
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