Is there a true plug-n-play setup for a 5.7 with FI yet?

Couple reasons I like the factory computers with custom Harness:

1) Least expensive even with custom harness etc.
2) Reliability - It is the most reliable operating system when turned into a stand alone
3) Tuning - Your base tune you are starting with has thousands of dollars and hours put in it by factory engineers
4) Aftermarket tuners - There are hundreds of tuning shops available that are very familiar with Gen3 Hemi tuning
5) Safe for engine - They use knock sensors to help save engine great for stock - strokers - boosted
6) Use your factory Hemi either new crate or salvage take out as is no buying and adapting cable TB
7) Clean engine compartment Easy install

Last but not least:
Product support - While traveling if something was to go wrong with ECU (highly unlikely) you could go to a Mopar Dealer in a pinch.
With a little long distance coaching from Modern Muscle we can get you going again.
FYI Never had to yet

Personal experience:
When we did the white Challenger in 2005 we used FAST, DBW, and AEM. We ended up with the AEM because there was no tuning available for the DBW so there was a significant performance difference. When the car was on DBW it was the most reliable and enjoyable to drive but lacked power because we were using a 5.7 tune up on a 6.1. Turn the clock ahead to 2013 and there is tuning available for stock, large displacement, and Power adders.

One last thing:
I always get the opinion from the people about being stranded by the DBW and they want to use a cable operated TB.
People, this is not the old days when we all had a can of starting fluid in the trunk or a spare ballast resister in the glove box. There are no quick fixes for computers. Even if all they do is fire your coil packs while you have carburetors mounted on top. I would much rather have the factory ECU that is designed to go 100,000 miles plus.