If you read through that efilive thread, a stand alone lml ecm/tcm combo was posted. It's not cheap at $5K, but it is designed to give lb7 type tuning to lly+ trucks. No nonsense, no bs, just straight tuning. And if it can work for an lml, it stands to reason it can be adapted to the l5p. And as to making the other modules work, I'm sure somebody like kidturbo could make a gateway to do so if there was enough interest. So yes, they could be tuned. But it won't be easy, cheap, and not for the average owner.