To allow this, we would need to see evidence that the TARDIS is capable of creating something like this. While we are aware that it’s bigger on the inside that it is on the outside, we couldn’t find anything about it having anything close to being able to generate what would constitute a pocket dimension outside of itself. We’ve only seen that it is capable of altering or shifting its own inner space. Even with three of them, its still doing something it doesn’t seem capable of.

But we aren’t experts on the canon, so if there is evidence of it creating something like this, we welcome you to provide.