Proper way of connecting wires to pins on polymer films
The fact that they are shaped more pointedly at the end suggests that these are in fact meant to be directly soldered.


  max. 1 mm,


soldering seems to be your only option, then.


  must stand a person's weight stepping on them multiple times


That sounds questionable, at best. Wire-to-anything-solid connections are notoriously prone to breaking under repeated stress; you'd want to add enough housing and strain relief to make sure pressure is only (if at all) applied flat on the contacts, and nothing pulls or shears on the cable connection. 

In fact, since this probably has to go into a housing with confined space: Consider designing a flex PCB with matching contacts on one and, solder to that, and use it to get the signal out of the mechanically stressed region.