You may want to talk to Cal at Hartline performance, when i asked him about tuning my supercharged Dodge Ram he said he actually has tuned alot of Dodges i believe he was talking about the Challengers and Chargers ,it was a couple years ago.
My Dodge had an aftermarket Fast engine control system though.
I think he would be the one to talk to, he is know as a Top notch tuner and he will come to you and do the Tune.
Generally what happens is you get a few owners together to make it cheaper for everyone and split the cost to fly him out and do the tuning.
He does this all the time with the Turbo Regals and is big on tuning the Fast Engine management systems.
I Don't know if he can help you out with the Hellcats or not but there is one way to find out.
On this same subject is it possible to use a Fast xfi system on the hellcat to get around trying to hack the Factory computer ???????????
If it can be used then maybe, just maybe if you needed to get work done under warranty the factory unhacked unmessed with computer could be hooked back up and no one would be the wiser.
All this sounds good in theory and may lead to dead ends but worth looking into.
As i said my Supercharged Dodge was running on a Fast System (Classic style not the newer xfi) and Cal was able to tune it.
Here is his Site, Let us know what he says.
http://www.hartlineperformance.com/