yo, Don't know if you got the answer you've been looking for, but i've dual modded a couple sticks. Its been a year, and so far they both work alright. One of the stick has a flashing home button, i have no idea what thats about.
xbox is definitely the way to go for dual modding as no chipset has successfully emulated a 360 controller. if you did have a ps3 stick, you would need to add an xbox 360 board.
I've modded two sticks to work for ps360, and i really only screwed up one. Yes there's a possibility but I did a shoddy job. The process is really a lot easier than you think but because soldering is involved there's always a chance for trouble --- please forgive me, I'm typing this on my phone possibly and so i'm very typo prone