If it was just adding a few lines of code somewhere to create a fixed-civ scenario from a Starting Point one that's definitely something I'd try. One thing Starting Point does give you is the ability to play other Civs not in the fixed-Civ scenarios. For me that might be the Etruscans or Lydians but we'll all have different favourites. So Starting Point has its place. 40 civs? 18 is still the optimum number for me, room to expand but also enough to fill the big maps.