I just bought a pair of these K-Line Super Street switches, did not install them yet. From what I can see they do have a spring inside the switch.
However from what I have seen and what I have been able to do with other switches, a DZ-1000 switch machine should be able to be used with these, just adjust the throw spacing correctly.
I installed a DZ-1000 switch machine on an old 027 switch, otherwise it was going to the trash can, it was a flea market buy in a large group, solenoid was taken off before I got it. Cut the plastic down with a dremel tool and put the DZ-1000 switch machine on it, best improvement for an 027 switch that I have seen. The switch looks bad but works great now, has excellent clearance for most freight cars.
Lee Fritz