I rather make a non-ACE version then an ACE version after. It's easier to convert from non-ACE to ACE than the other way around.
Is it possible to make a mission with MCC and then make it not required MCC? I didn't remember that being possible, but I don't know.
Is it possible to make a mission with MCC and then make it not required MCC? I didn't remember that being possible, but I don't know.