Alright, why not. As i'm sure some people might still remember, a while ago I made a joke about T11 hype and called it Socka Trova. It was an impromptu transpo of sorts, using a Sock. While it started out as a pretty funny joke, i'm pretty sure i've actually come up with a method. It's still very rough, still in progress, but this is the idea of how it works so far.
(The whole sock thing's obviously just a joke, you can use a bag, but as of right now, it should be a dark one.) You have a Sock & Rubber band on the table. The Sock can be borrowed. You display two different four of a kinds (Let's say Kings & Queens), then replace them on the deck. You show the kings, all four of them, as you place them into the sock. You hand the sock to a spectator and ask them to tie it off with the rubber band, and tell them to hold on to it, making sure that no one else touches it. You won't be touching the sock for the rest of this trick. You display the four Jacks and count them off. You make a magical gesture, and spread to show that one of the Jacks has turned face down. The Jack Of Clubs. Drop the cards on the table and say, that because the Jack Of Clubs turned face down here, that the King Of Clubs must have turned down inside the sock. You ask the spectator to remove the Kings from the sock, but not to spread them. Ask the spectator to turn them face up, then have them spread the cards. Sure enough, the King Of Clubs is face down, but when they turn the card over, it's the Jack Of Clubs instead. You ask someone else to turn over the face down card on the table, and it's the King Of Clubs. Completely examinable.
This is only phase one. Phase two involves a full packet transpo, i've just not worked out a method yet. If phase one works out, i'm thinking of writing a PDF for anyone who wants to see the method.