Do you put the 60fps on a 30fps timeline with interior clips or keep it on a 60fps timeline?
Not an easy answer.
These type of shots are the weakness of the
M2P.
If wanting the absolute best quality, it would be best to keep it in a 60 fps timeline.
Depends on many variables what route to go.
In the OP scenario, 60 fps filmed and 60 fps timeline sounds like the way to go.
But IMO, it will still be better quality dropping the 60 fps clip into a 30 fps timeline than filming in 30 fps.
It's what I usually do when mixing frame rates.
Or you could drop the other 30 fps footage with the 60 fps footage into a 60 fps timeline if wanted.
You could use Optical Flow - Speed Warp in Davinci Resolve Studio, to interpolate the 30 fps footage as an example.
(rather than just duplicating frames)
It does an amazing job. But very slow and resource intensive.
It's also a method I use on occasion.
Hopefully will be easier with next model of Mavic if it will do 4k 60 fps.
Be glad to hear other ideas on workflow etc.