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Couple of thoughts:
1. It’s not worth to spend time trying to figure out read/write process by sniffing the can communication given that there are tools out there which can do that on a budget (some PCMFlash module can read bmw zf 8hp even though it’s only listed for VW group cars) moreover, before the trans will let you to get into the programming session, you’ll have to pass a seed-key authentication. It’s not likely you’ll ever figure it out just by sniffing, the right way to do it is to actually look at the disassembled code. And again, for the cost of 170$ that pcm flash module costs, it’s not worth it. Better spend the time figuring out #2.
2. The trans is not allowing to shift from park because of the immobilizer. It will not shift from park unless dme and cas/fem modules from the original car are present. Worthy endeavor is how to patch its firmware to disable this immobilizer function.
Anyways, just my .02$
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