There are still a few metisse around the country. I know of at least 4 in SA and tony c and a few other had some at tassie, i guess your after a certain donk in it or can you just change out the engine to plates ?
I Saw a YAm DT1 Rickman Metisse not long ago and it was original kit so they definately got into the JAp 2 stroke stuff in 69' as well. actually the Dt1 made the thing look a bit more normal ,shape wise i thought.
The Classic style bike looks a better bike anyway , give that a go.