These are all really good ideas. Are there any decks that come close to incorporating many of these?

I'm still chewing on this! I'd alter the backs of the re-release New Fan Back so that it subtly have a one way back also.
If any experienced kickstarters want to take this on I think it would be great!

Sorry to revive an old post, but I've finally received my custom decks after a LONG and TEDIOUS journey with LOTS of learning through the process with Cartamundi, but I'll leave the details in a separate post in the not so distant future. Wish I found this post earlier, but here's a few of my inputs.

Firstly, I went without the double backer option as I hardly ever seem to use any of them, & I figure that if I ever wanted to perform with a double backer, there's HEAPS of custom decks already out there that I can use. Instead, of the 56 cards, I had the standard 52, one joker & two blank facers. The idea being that for every 26 decks I open, I will have a deck of blank faced cards with my personal back design. Also, if I wanted to have 2 jokers in my carry deck, I could always just borrow from another deck (considering I ordered 500 of them... =P) But wait, 52 + 1 + 2 is only 55, I hear you say. What about the last card? Well I'm glad you asked. My deck box design was designed based on the Magician tarot card, so I thought I'd also include a Fool as well based on another clown character that I play. The Fool also has a 3 of clubs reveal as a slight nod to P&T, of course.

On the box design, I've matched it with my namecard, which is based on a tarot design of The Magician. On the bottom of the box there is a barcode reveal (thanks for the idea, Ellusionist), & on the sides I've also included 2 QR codes, one to my website (for more formal clients), & on the other side to my Instagram (for the younger, social media type audiences).

Side note, the Joker design is just a mobile phone selfie in the bathroom mirror of my chest tattoo... =P