Not sure if this answers your question exactly, but I once heard a guy say "I speak English and bad English."

For me, I speak the King's English (aka English from England), and I also speak American English. I prefer the King's English, but there are times when American English is just better. I could not tell you how to spell manoeuvre and even typing it, I have to Google it to be sure it's right because fuck that word sideways. Maneuver just looks better. But honour, valour, even colour are just... better... than their American counterparts. And centre and metre just feel right, though it's pronounced -ter. As for theatre, theater and theatre are two different things. Theater is the same thing as cinema, and theatre is where a stage play is performed, or like, the theatre of war. It's a more dramatic term.