Is it possible to edit Orca's final GCode?

[bbinnard]

This command is the only entry in my Filament End GCode section:
SET_DISPLAY_TEXT MSG=Finished

This is what the actual end of my Orca's GCode looks like:

;TYPE:Custom
; filament end gcode
SET_DISPLAY_TEXT MSG=Completed
M104 S0 ; turn off temperature
G28 ; home X axis
M84 ; disable motors
M104 S0 ; turn off nozzle heater
M140 S0 ; turn off bead heater
SET_DISPLAY_TEXT MSG=Finished
M73 P100 R0
; EXECUTABLE_BLOCK_END

I added the SET_DISPLAY_TEXT MSG=Finished command in Orca's Filament/Advanced/End GCode section. Everything works OK.

What I want to do is change the G28 command to G1 Z50, but there seems to be no way to do this since my End Gcode is inserted before this. Is there a trick to adding code at the actual end of the generated GCode, or maybe a way to change the G28 to G1 Z50?