The basic process is, you export the data from Plotter for Windows to a special file that ExpoDev can use (this is the same process for any version of ExpoDev). You then transfer that film file to your iOS device by using iTunes (a simple drag/drop on ExpoDev's document folder) or you can just email the files as attachments to yourself and open them (once ExpoDev is installed). ExpoDev will then import the file into the list of films.
That's about as easy as it can get for an Apple device and I think it's much simpler than trying to use an old Palm device these days.
So, you still need access to a non-Apple software platform (i.e. Windows)?