Is it possible to have Ironman enabled by default?

I prefer to play the game in Ironman mode, but I need to enable it every time I start a new game. On the off chance I forget to do this I either need to continue playing with it turned off, or restart my game.

Is there anyways to have Ironman enabled by default? Alternatively, if there is a way to enable Ironman after the game has started that would work as well.