Idiomatic Emberjs for nested routes but non-nested templates

This is a follow-up from Understanding Ember routes.

Master/detail views are great but I'm trying to have a a hierarchical URL route without nesting their templates. However, I still need access to the parent model for things like breadcrumb links and other references.

So /users/1/posts should display a list of posts for user 1. And /users/1/posts/1 should display post 1 for user 1, but it shouldn't render inside the user template's {{outlet}}. Instead, it should completely replace the user template. However, I still need access to the current user in the post template so I can link back to the user, show the user's name, etc.

First I tried something like this (Method #1):

App.Router.map(function() {
  this.resource('user', { path: '/users/:user_id' }, function() {
    this.resource('posts',  function() {
      this.resource('post', { path: '/:post_id' });
    });
  });
});

...

App.PostRoute = Ember.Route.extend({
  model: function(params) {
    return App.Post.find(params.post_id);
  },
  renderTemplate: function() {
    this.render('post', {
      into: 'application'
    });
  }
});

This replaced the the user template with the post one, as expected. But when I click the browser's back button the user template doesn't render again. Apparently the post view is destroyed but the parent view is not re-inserted. There are a few questions on here that mention this.

I then got it to work with something like this (Method #2):

App.Router.map(function() {
  this.resource('user', { path: '/users/:user_id' },  function() {
    this.resource('posts');
  this.resource('post', { path: '/users/:user_id/posts' },  function() {
    this.resource('post.index', { path: '/:post_id' });
  });
});

...