I found this on a different site, but could be helpful for someone here too. Back up your main save (i saved it to a usb stick) and start a new game (I deleted my console save too), play normally, if you die the only options are change weapon and retry, hold the PS button and close the game, load the game up and continue on. This definitely works as I just did it this way, glad I didn't have to mess around with save files for every death
