I love this. For YEARS I have been saying I wish we were taught how to navigate the healthcare system while we were still in high school--as part of health class.
The one thing I would change is to take one step back from "death" and make this a more expansive message focused on advance care planning (which would ultimately include the end of life process, death and grieving). Your curriculum already makes sense for the advance care planning vision--you include the Go Wish game, after all!
Part of the curriculum could include drafting an advance directive and bringing it home to share with parents. Bringing a message home to parents has helped in the environmental realm as more kids learn about recycling at school and then ask their parents to recycle and use less energy in the home. The kids end up teaching parents! I could see this same effect on parents learning the important message of advance care planning, EOL, etc.
My only concern is about the name (and I know this is probably not the final name). Registries in a healthcare or government setting are usually pretty serious.
I know in California, the advance healthcare directive registry is managed by the the office the Secretary of State, and there are a number of states who maintain electronic POLST registries for capturing the medical preferences for life-sustaining treatment for people who are at the end of their life.
Perhaps this could be called the "After you kick the bucket Bucket List." ;)