Combining Mavic Pro w/ DSLR Slow Motion Footage

Testing out combining footage from my DSLR Nikon D750 and the Mavic Pro's video. I made the mistake of recording on the Nikon at 60fps while recording at 24fps on the Mavic. So the Nikon footage doesn't easily slide into the 24fps timeline (60 / 24 = something wonky). Slow motion clips came out pretty good though slowed down 42% in Premiere Pro. Using Optical Flow Frame interpolation.