david,
could you please tell us, how you will change the video-material to match with 25fps.
will it be conformed to 25fps or will it have the same duration. if it´ll be confomed the best way to go might be to change 29.98NDF to 24fps and then conform it to 25fps, so you´ll only have a 4% speedup, and a 1/2 semi-tone pitch up in the audio.
I would advice to use text-files with the format-conversion, because it´s the most easy way to change the TCs from 29.98 to 25fps.
if you will be sure, your japanees txt wont get in trouble you might better use an image-script.
cheers
danny