Is It Possible To Get What I Want?

Couple of questions:
1. What particular issue do you have with drive by wire?

2. How much plug and play are you looking for?

For question #1 If you reasoning is safety I think you're misguided. With the exception of the Toyota fiasco with their DBW setup. Manufacturers have had an excellent safety record with DBW. Incidentally, one of Toyota's issues (they actually had several) was their lack of a key safety feature. With virtually all other DBW systems when the computer sensed application of the brake and throttle at the same time, the computer would close the throttle. Makes power braking a bit tough, but a good safety idea.

If you're concerned that you won't be able to use the stock pedal that is unfounded. You can use your stock pedal. The 2003 Hemi used a standard pedal and the cable ran to a small box under the hood, inside the box was a potentiometer that would send your throttle input to the computer.

In reality if you're simply want a cable operated throttle, because you want what you want, that is cool too, after all it's your car.

For question #2

For true plug and play the only real setup is the one that uses the factory computer. All of the other setups will start you off with a "base tune." The quality of this base tune varies, unlike bolting a Holley Carb on your LA motor and expecting it to run pretty good, the base tune might simply get the motor running.

Now many modern EFI setups that rely on a wide-band O2 sensor will offer auto-tune. Where you simply drive the car around and the computer essentially programs itself. This is available for the Holley, Megasquirt, and FAST systems. Reviews have generally been positive.

Whether YOU will be able to integrate these modern systems EFI systems with the Hemi VVT is uncertain. Though the latest version of MS3 DOES support VVT.

As you can see although features like Autotune and companies like EFI source make aftermarket EFI MUCH easier. I would argue that it is not plug and play.