Now that we have a unified Accessible hierarchy covering both local and remote, it should be possible to fake return the
<select> element Accessible as the parent of the select dropdown. Doing this in the other direction will be uglier, but I don't think any client depends on that, so we should address that elsewhere if we need it.
Note that Windows won't be able to benefit from this until Cache the World is done. That doesn't prevent this from being worked on, though; it will still benefit other platforms and Windows will get the benefit once CTW is enabled.
The ugly bit here will be creating a LocalAccessible specific to the ContentSelectDropdown. I don't love the idea of matching on id, but I'm not sure what else we can match on. We'll need to restrict this to privileged root documents or similar to prevent spoofing.