What you're referring to as double forms are often called two person forms.
In Okinawan weapons tradition they're part of the staple. Isshinryu has a Bo vs. Bo and Bo vs. Sai tradition, and others use them too.
On the whole where Chinese systems, Japanse Judo kata, and many other fighting traditions use them, they don't seem to have been imported into Okinawan systems.
I've studied a few of those traditions and the two person form has great value.
Bushi No Te Isshinryu