My suggestion: Use only f2 world map
Why?
1 With not so great number of player a smaller world map increase the encounter between pc chance.
2 Less History incongruity, Shady sands become Ncr and Boneyard is not in new california republic? or it is and so few changes?
3 With few cities all the quest of the southern town would end in protected cities of the north (NCR , VC , SF)
and the quest of necropolis would end in bh i suppose , so the world would seem with more quest and player will find its
more easily