Help needed to get my 7i76E + 7i85S + 7i73 on my mill going.

Cannot find M3/M4 in the link you just sent,

So is this not valid anymore?
forum.linuxcnc.org/38-general-linuxcnc-q...-edit-macro-m3#17521

Having trouble to wrap this in my head how to do this remapping.

You might have a point, it may not currently be possible to remap M3 and M4.
Sorry if I pointed you down a blind alley.

Do you think there could be a way to get wanted function in the comp?