I've extracted the Historical Spawn Dates component of my Dynamic History mod project, and updated it to last G&K patch...
It's now balanced enough to be used for RFC like scenario on any TSL map.
There is one file to edit if you want to change spawning date or add date to custom civs: HistoricalSpawnDates.sql
This version is ready to be used with my G&K City States mod for YnAEMP, and should work fine on the Giant Earth or Large Europe map. I'll suggest the Large Europe for a better experience.
You can change the balance mechanism by editing HSD_Functions.lua and HSD_Defines.lua.
Basically it convert nearby Barbarians to your side, do the same to CS units and even remove the CS if too close of your spawning position.
"Not too close" CS are given a relation bonus.
You get science and culture points based on the average number of techs/policies from other civs. Same for gold, faith, golden age turns and can also get some free Great People based on the average cost of all other civs buildings.
Comments and discussion on the mod' thread.
Use as you want in your own mods, just remember to give credit
Historical Spawn Dates (v.6) 2016-10-05
Historical Spawn Dates (v.6)