It did catch the attention of an engineer!
There will be no real benefit to adding 2 stroke motor oil to your fuel to counter-act the effects of ULSD.
You would be better off just going to the grocery store and putting in a quart of cooking oil to your diesel. You can add as much as a gallon with no ill effects!
This will be much better for your engine than 2 stroke engine oil which will bind things up pretty good if your going to do this a lot.