The only suggestion I've got, aside from what's been stated about moving the player:
Use some scripting to set the maximum health of the player to 150, and their current health equal to current health + 50. Then the player spawns, gets the boost in health, then takes the 50 damage. You'll then need to reset the maximum health to 100, and you'll probably want to disable the red damage HUD while this happens and then reset it to happen after this.
Not the prettiest suggestion, but it should work.
Priest of the Church of Joe Wood
In memory of Nanee. 9/1/1993 - 5/16/2009. Rest in Peace, little girl.