Why would you want all the girls at the same time on the island?
Not possible normally or by console commands as you would Bork your game within seconds if you could.
I could see merit in the other way, reducing it down to one girl on the island, so you could concentrate just on that girl.
But that would Bork the game as well due to nobody to do Doc/Reception/Maid duties.
With console commands you are messing around with the game code, so increasing the chance of borking your game.
The more you use them, the more you will Bork your game.
Just play the game how it was intended by the creator.
If you can't handle doing that, then maybe play something else more to your ability level.