Have you considered some of the ICUS programs around?
I got my first few hundred hours on twins after applying and then being accepted into an ICUS program with a freight operator. These programs offer ICUS hours at a small cost which IMHO is worth the initial outlay as they are a guaranteed way to build twin time. (The program I was in cost about as much as an instructor rating but over the course of six months I gained nearly 100 hours in a PA-31!)