I do not claim to be an expert on anything ps3 or hardware related. But why couldn't someone take a broken ps3, take its ram chip and add a second smaller ram chip on there making a sort of mod chip? The second ram chip could have the function to dump the ram, It would be totally undisturbed because the ps3 wouldn't realize it was its more than expected.
This would allow you to dump the entirety of the ram with no clipping. This could also be used to extract the keys as you could read them as they go by.
1. Make mod chip for ram that allows firmware to load onto it and also dump then entire contents
2. install modchip