Bad idea. Multikonts will occupy the majority of 15c, and you will be minus 50k of crop and 15c or 9c missing. You will have to spend a lot more coins on the NPC. But you probably mean it? Are you going to the pay to win model? P2W?
In my opinion, it should be possible to take over gray capitals on the 9c and 15c crops. If someone does not play, why should he occupy the right places on the map?
Crops should be more. But, of course, it will not be, because I wrote the reason above (P2W)
OFFy for a WW will be smaller and it will be easier to defend a WW. Players OFF will have more difficulties and players DEFF more easily.
This is not a good solution. It will end with the fact that people who do not spend a lot of money on the game will have even harder time and will leave it. You lose the players and that's it.