That will involve cooking as a “Mod” specifically, not a “Map”, and overriding this core Blueprint “Primal Game Data” with your own classes replacing the original ones (such as replacing WeaponBow with WeaponBow_drb1922 :).
Blueprint’/Game/PrimalEarth/CoreBlueprints/PrimalGameData_BP.PrimalGameData_BP’
However this form of Mod is not supported in v184, but will be in v185 by tomorrow 
Cheers,