A king would do fine and is an excellent first snake choice. You'll likely handle it frequently, which is all that's required for 99% of the kings out there to maintain calm and not become chewers. Get a young one and work with it. Expect a bit of defensive striking and musking or, maybe even better for your situation, look around for one that's already on the calmer side. Washing your hands between reptiles is never a bad idea.