Hi! Tei,
I took a peek at the link in your post. Do you mean to edm the vanes?
I have read somewhere about a spark erosion "kit" that can be set up on a conventional mill.....I haven't met someone using such a device but i know it could possibly work for you.
I don't know anything about electro chemical machining, LOL!
If you needed something wire edm you can send me a PM, the only obstacle is that i'm down under in Africa.
Klox