Here's the service information from Rotax with written instructions.
http://www.ultralightnews.ca/cdrive/massweight.pdf
The wire is just described as "thin". I used .035 MIG wire since it was handy around the shop. The initial degrees of rotation is not exactly critical, but they say 5 to 10 degrees.
I don't think many (if any) would stop using the IVO... So far it doesn't seem to really be an issue at least with the medium on the 100hp.