If I were you, and I'm glad I'm not, I'd be sick. While it's enticing to think about turning a bad situation good by rebuilding what you have and adding the Carpenter goodies, I'd have to think real hard not just about the money but the time and energy to get it all done. If it's what you were hoping or planning to do anyway then go for it, if it's only a thought as a result of your misfortune, I'd take Warp9.9's advice and try to get the 2011 motor GAURANTEED on Ebay and simply swap them out. Afterwards, put your block up for sale for someone who really wants to monkey with it for their own reasons. You would then get something to put towards the newer motor and it might not sting so bad? Hell, I might buy it and send it off to Carpenter.
Just my thought, sorry for you and others that have had this transmission thing happen to an otherwise incredible machine.