So, I rewatched Amy’s Choice and Rory’s ‘death’ scene is literally TST.
The framing, pacing, and narrative beats are all the same. Even the “promise me you’ll look after the baby” and “you’re supposed to be a hero, otherwise what’s the point of you” moments are the same.
After TFP’s more overt film references in comparison to TST and TLD’s subtler Bond etc., I wouldn’t be surprised if the fourth wall is being broken in the fact that Sherlock and John have actually watched Doctor Who together and this scene within TST is literally a recreation of Amy’s Choice, EMP or otherwise.
Culverton Smith in TLD would then actually be based on Toby Jones playing The Dream Lord, meaning that technically Sherlock and John “exist” in our own reality / a very near parallel universe.