According to https://byo.com/mead/item/1908-yeast-nutrients-techniques you can combine the DAP you have now with dried yeast hulls, which have all the nutrients in sufficient amounts except for nitrogen and phosphorus, which DAO supplies. Plus: "A half teaspoon of DAP is generally recommended for addition to a 5-gallon (19-L) batch of wort".
Thanks for the link and the info. That is very helpful. So it's basically partial yeast nutrient as it pertains to beer anyway.
Looks like LD Carlson's yeast energizer is what I was assuming this was
"Contains diammonium phosphate, yeast hulls, magnesium sulphate and other nutrients to keep yeast active for longer when used after fermentation has begun. Use to help restart a stuck fermentation and to increase active yeast cell count. "