Corruption traps have a very large (maybe infinite) number of charges, so burning out the trap is not an option.
Disarming the trap is a possibility with appropriate skill or spell.
You could build a bunch of doors around the trap.
Switching places should work, though it's slow. Note that killing one trader doesn't make the level hostile regardless of what you do. I regularly kill all of the non-lizard traders to simplify things.
You could always just stand on the trap yourself for awhile and wait for a really long time until he does a restock or two. 100-200 lizards is generally enough to finish the game.
[edit]You have teleport spellbook... any reason you can't use that?
Hoping to win with every class, doomed. Archer, Barbarian, Bard, Beastfighter, Druid, Elementalist, Farmer, Fighter, Monk, and ULE Priest down.