Pah! This would not be Doom's Hell. Mere hordes of demons? Not even worth the time it takes to commit a sin worthy of being sent there.
Doom's Hell would involve being locked in a room where all his ideas and plans and scientific developments are peer reviewed by Reed Richards, and only when (the accursed) Richards has edited and corrected the plans so they ARE perfect can Doom leave to carry them out.
So Doom must choose between carrying out a plan which Richards has improved, or not committing any plan at all...