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I THINK (But need to test) that it would be something more like this:
{REPLACE "; layer 4, Z = " "\nG1 X10 Y5\nM600\n; layer 4, Z = "}
(where you change the layer number to suit your needs)

The Prusa Original i3 Mk2(s) does not recognize the M0 command as a pause in this dialog, so what I had previously done was saved my S3D project as GCODE and manually edited in the M600. M600 is Prusa's Marlin command for a filament change - which literally lifts the Z, moves it to the side, then beeps loudly at you until you begin following the prompts on the LCD to go through a filament change and purge.

If you are at a place where you can test that replace line, go for it - otherwise I'll try it out when I get home. Or, better yet, maybe someone like @STIG_ will jump in and be the educated voice of reason! :D