Mach handles tool changes no problem, just use M06 (normal gcode tool change)
Check in the general section top left, there is a few options for what the m06 does.
You can copy and paste the three sets of code together with an tool change before each set of code, you may have to get rid of line numbers though, not sure about that bit, but there are a few programs available that will help you with that.
The basics of gcode aren't hard so it's worth learning.
Hope this helps as I'm no expert :-)
Steve