I may be in a Monday fog, but you don’t want to apply two styles to one paper. The better choice is to modify the style that meets most of your needs. If your Ref2 is designated as Reference Type Electronic Article it should style correctly in any style that is also styling Journal Article (the Output Style must have Electronic Article in the Bibliography/Template when you examine/edit the style)…
The ACS style you mention has Electionic Article as a reference type so it should style correctly…However you don’t have some of the data that appears in the bibliography such as Date Accessed so perhaps your reference for AFP is Journal Article instead of Electronic article? Just flip the Reference Type in the AFP record to Electronic Article and you’ll see the additional fields where you can add the data…
also, make sure your Author is entered as
AFP (Agence France Presse),
NOTE the ending comma which is EndNote’s clue to treat the Author as a string/phrase
have a nice day,
virginia