So all of my party members are on the brink of death, so I thought let TNO rush forward and kill the guards since he respawns with full health every time he dies. As you might imagine this is quite the chore, so I wanted to ask if I could cheat in some healing items or something. If you know some cheats please post them here.

If you go back to the area before the zone where Trias is being held prisoner, you can find a "hermit" walking around the NW area. He will let you rest there as much as you want. The prison guards won't respawn or anything either, so you can rest -> go kill a group of guards -> go back and rest, etc.

I never fight the guards. Feets are your best friends in this part.