impish,  I tried your script.  It worked!  ...kinda 

Unfortunately I tried importing my 'other camera' into my Vue file where I had already animated a different camera... instead of 'adding' the camera I imported... it 'went haywire' as they say and combined the current animated camera path with the imported camera path to produce what I can only describe as a path that looked much like spaghetti.  But if you want to use the script to import already-animated cameras onto a 'brand new scene's camera' I think it will work beautifully.... but it will ruin any info you already put in the camera in existing scenes... at least as near as I can tell.

I am very impressed w/ your ability to write a script like that... thanks.