I have the MPV1 and saw there is an offer to upgrade it to the latest MPP3 for $400 that includes 8 credits. There's also a $250 cost to unlock the PCM (total of $650). Another option is to buy the MPV3 + 6 credits ($700 total) and there's a complimentary Dodge upgrade. All I plan to do on this 2015 Dodge is delete MDS (2 credits), so the other credits are not needed. I learned I can't resell them, so is there a lower cost option here?