GC would be the ONE Kusari group that might work with them as they are fine with bringing cardamine into Kusari which is a huge taboo with the rest of the system.
I'd say the Dragons would be slightly tolerant of them so long as they were in and out respectful and business like and brought gifts. They would be about as welcome as construction workers are working on your house. You understand they have to walk around in it but you keep an eye on them and don't want them messing with your stuff.
They would never be friends. Some Dragons might accept them as a necessary evil but would never want a permanent presence in Kusari.
Remember the "hard coded" role play is despite their best efforts, the Junkers have not been able to gain access to Kusari as a real market.