When you turn on the infinite money mod, the game is still keeping track of how much money you really have under the hood. So while I can't think of any way to directly "boost" a city to a certain level, the best I closest I can think of is to turn on the infinite money mod, play until you get to the size you like, and then turn it off.

Progression is usually quick enough with infinite money that you really shouldn't need to worry about the unlock all mod if you don't want to "break it" in that way.

When you turn on the infinite money mod, the game is still keeping track of how much money you really have under the hood. So while I can't think of any way to directly "boost" a city to a certain level, the closest I can think of is to turn on the infinite money mod, play until you get to the size you like, and then turn it off.

Progression is usually quick enough with infinite money that you really shouldn't need to worry about the unlock all mod if you don't want to "break it" in that way.