I've yet to see any of the projects I am following that reverses other games to see a C&D for converting/porting scripts to emulate/mimic/alter behaviour.
Afterall FF games does not have any ownership of the behavior their scripts executes, only the code directly(which only prevents you to copy paste, which you aren't doing when you convert by hand, you simply mimic the behavior of the script), if you write something which does the same thing, they really can't do anything about it.
paul: the point is that sounds,fields and models when formats are fully known can be automatically converted on first run per user(this is allowed as you aren't distributing anything) usually this is done by other projects by asking the user to find/select original game data folders/archives.
and even if converting opcodes/scripts might be hard there are multiple cases where this is also converted, even per script based scenarios.
Most countries I can think of also do not allow patent or directly copyrights code in that sense(unless you actually copied and distributed the original file, which you aren't doing).
I'd seriously start to wonder how people who only does texture touch ups for games(not making new similar ones, but only tweaks the original textures) is able to distribute their versions, afterall this to me seems to be exactly what modders who only increases the resolution of the original FMV/Textures(or uses original and adds filters to them then distribute them), details of models are doing.