Another wheel just broke, and I'm now out of spares supplied by Maytag during the warranty period. So, here's my hack to reattach the wheel and keep it washing dishes.
Step 1: Broken Wheel Bushing
Step 2: Identify Replacement Part; Decide Not to Immediately Order
Step 3: Drill Out Wheel Bushing
Step 4: Install the New Bushing
Step 5: Cutoff the Extra Length of Bolt
I ran the dishwashwer and didn't hear any crunching noises, so I assume it's fine.
This bolt isn't stainless, so eventually it will probably start to rust. I hope to have a new proper wheel by then.