Thanks! I wrote a small python script for dumping most of the passages into Renpy "labels", but there was a bit messing about with variables and some story parts that my conversion script didn't handle. Plus there was a bunch of re-writing things to be more "renpy-like", i.e. removing part like "Don says" in favor of simply displaying the characters name.
Translating it to spanish again is going to be a whole process though... can't re-use the old translations due to so many changes :D