This is late but I have done twin needle work with my Janome emb machines!
I have been in classes with trevor also using this
Then I have taught classes on it!
You need a plate with the regular wide hole!
Then you need the twin needle for emb -it is setup differently
There are a few different widths
The reg twin needle for regular sewing -has shank In Center
Will not work
The emb twin needle is offset
Kaye in la