look i don't know much about this stuff but i have been doing a bit of research, do you guys know if i could use the BadWDSD method on a eMMc ps3 to get the erk?
Did not. It not dumps ERK but ATA and ENCDEC keys. It is sufficient for full disk decryption because those keys encrypting it (ERK have more purposes than that). They are calculated from ERK, that's why many people saying its decryption key, while it is not, just mind shortcut. Dumping and retrieving are done in tricky clever way.
However, that's not yet possible on eMMC models. These are last bastion left in this manner.