Anything that is deemed to be Sirius-wide civilian would behold civilian for sure and certainly not a house title within its name. In the case of the Kusari Explorer, the infocard never mentions civilian but does state Kusari many times. As such it can only be a Kusari-civilian craft.
I've just noticed that both the BD & GC are permitted to use this, but should not be able to dock with Yukawa because the lanes would cause it become hostile. If you're a criminal and the lanes aren't shooting at you, there's a problem.