How to generate crosstalk between 2 wires?
Crosstalk is due to either capacitive or inductive coupling.  You seem to assume only inductive coupling, but gave no justification for that.

Capacitive coupling is the easiest to simulate.  Just connect a capacitor between the two wires.  Depending on the length of wire, their spacing, and what insulation is between them, this might take a few pF to a few 100 pF.

For inductive coupling, loop a few turns of each wire around the same ferrite stick.  Make sure to use a ferrite material specified for your frequency.  In this case, the far ends of the wire need to be loaded as they would be in real life.  Inductive coupling is due to current, so you won't get any coupling without current flowing thru the wires.