Between AROC and IROC, I used another advanced organizer and a desmos graph to help develop the concept behind the limit formula for IROC, and I think that worked well. Post coming soon with more details.
In a very sinister way, I love teaching students to find a derivative using the limit definition, watching them struggle, knowing that very soon, we will be learning the power rule, and they'll hate my guts for making them do it "the long way." ;) I explain that while we'll rarely, if ever, use "the long way" again, they have to recognize for AP purposes when they see it that they are being asked to find a derivative.