Disconnecting the battery is not going to make the TPMS system "learn" new modules.

If a Chrysler dealer equipped to set up Crossfires cannot make them work, go to a real tire shop - dealers just don't usually work out well. Having said that, I had to take my two Roadsters in when I swapped tires and wheels between cars, took my local dealer less than 5 minutes a car to "teach" each car it's new TPMS sensors. And that was in rural Georgia, where they seldom see Crossfires.

I think you are going to the WRONG dealer.
I have no idea if ours are 315 or 433 mHz, supposedly they are 433 mHz, but I can't say for sure.