I think you would have to make up buttons on screen and make them VB buttons, you would then set these buttons to the keystrokes you wish to use. Next you would save the screen, load it from Mach then you would go to operator menu and Edit Button Scripts, they will be flashing, click on the first and the VB editor would open. You would then type something like the following fr OutPut 1
If GetOemLED(852)Then
DeActivateSignal(OutPut1)
Else
ActivateSignal(Output1)
End If
You would then save and exit the editor and when you pressed the keystroke you had set it should run the VB and either switch on or off output 1.
You would then need to repeat for the other buttons replacing the output numbers and the output LED numbers in the script
There is an easier option if you do not use the spindle, the flood and the mist coolant, you could set these outputs to be for the spindle, flood etc then the only thing you would need to do would be change the hot key assignment in the screen editor of the spindle, flood and mist buttons to the keys you want.
Sounds complicated I know but its just I am not great at explaining things

There may be an easier way but cant think of it if there is.
Hood