Prevent Users from Deleting a task

We would like the ability to limit users from being able to delete a task assigned to them. We don’t log hours we we are unable to remove that ability from them in the Project Preferences. The issue is when we try to remove the delete functionality from them, it also removes the ability for them to complete the work on the task. We tried going a layout template route as well suggested by support. According to support, Layout Templates only control the Delete action in the task Details view; there isn't a way to hide that same action in the project's task list (grid) view, since that's tied directly to the Delete permission on the Access Level. Because unchecking Delete at the Access Level can also block completing multi-assignee tasks, there isn't a configuration that fully satisfies both goals (deletion blocked everywhere, completion always working) at the same time today.