I do not personally recommend mixing oils because everything you need should be in the API Approved Pennzoil Platinum or Mobil 1. The biggest thing is no company will stand behind the oil when you mix it. I get it you want to add some ZDDP, an anti-wear additive, but it is not like the honda is a flat-tappet engine.
Additionally too much ZDDP can foul a catalytic converter though somehow it didn't cause us any problems back in the SJ and SL days when pretty much every vehicle had a cat and they didn't start taking out the ZDDP significantly until SM.
Generally pretty much any oil is mixable. It probably won't hurt anything, but I cannot tell you to do it. All I can really say is that your vehicle was born in the API-SM days and that ultimately you need ot use whatever the manual says.