Did you not read the op comments? He can solder, is not afrad of a little wireing, and cost is a concern. Have you even played with mega squirt? It's really not that hard. The factory engine harness has a plug that ties into the factory chassis harness on the ram. So if you utilize that plug, and wire the megasquirt to the chassis harness side the factory engine harness will plug in to it. and the wiring is done. You can buy a tested and assembled PCM from megasquirt. As well as the pcm harness.
You can get plenty of help with tuning via megasquirt's message board. There are enough guys running megasquirted hemis that someone is bound to be willing to share a tune file. (that will get you running) and if your not comfortable visit a tuner. Have it dialed in.
I honestly think your saying it's not so easy has more to do with your lack of experience with the megasquirt. I built the PCM myself, they have really good manuals and are easy to follow. I would honestly recommend it to anyone willing to put in some effort and save a few $$$ vs the toss cubic dollars at a car to make it pretty mentality. $1000 is way too much for s stupid harness, then still needing to source a PCM, have it flashed, and then worry aboutnmsking actually fit the car. Seems harder than building a harness from the glove box through the firewall to a factory harness, and plugging it in. Then you have one plug to remove and the engine can be installed or removed. Seems like a better option to me, bit then again I'm not scared of work. I'm broke and cheapest is best for me.