It's up to you whether you use the GM or GP to slingshot to CS... although the upkeep cost of running Bureaucracy is high if you beeline using the GP because chances are your capital won't be as developed untill later into the game during the middle ages.
The only exception for early Bureaucracy is Being either organised (halves the upkeep cost) or Spritual because if your economy starts to suffer you can switch back to Barbarism easily without the cost of anarchy.
If you want a Early CS Slingshot use a GP
If you want a Late CS slighshot use a GM.
The only exception for early Bureaucracy is Being either organised (halves the upkeep cost) or Spritual because if your economy starts to suffer you can switch back to Barbarism easily without the cost of anarchy.
If you want a Early CS Slingshot use a GP
If you want a Late CS slighshot use a GM.