2003 Dodge Grand Caravan, Infinity Amp Interface?

After market radios do not work, because it evidently is hooked up through some kind of low-level signals from the head unit to a factory Infinity amplifier, which then powers the speakers. The amp also relies on a PCI data-bus signal from the radio to turn on. So far I have not been able to find a PAC style Radio Output Emulator Module adapter that fits the 22 pin/10 pin model of the 2003 Dodge Grand Caravan ES (3.8L). The factory radio in the Caravan is model P05064123AC. Anyone know of an adapter which will allow me to install an aftermarket radio that works with the Infinity amp in this specific year of Grand Caravan with the 22/10 pin harness connectors? The ones I've found for the Caravan are for the 2001 model, with two seven pin heads, and won't work. Also, they have some which have the right harness connector, but they just go to RCA plugs, which I don't think will work with the infinity amp, since there's nothing to sync with the PCI signal, etc. Are there any other solutions short of rewiring all the speakers manually?

Thanks.