But the thing is, if those keys were to be leaked the damage would be irrepairable. You could legally donwload the reverse engineered firmware and then "acquire" the key and plug it in.
Might have better luck with the Taiwanese hardware vendors - as I recall a major Taiwanese PC motherboard maker got hacked recently and UEFI secure boot keys were taken, so they probably weren't storing them in an HSM and don't have proper security practices in place for cryptographic material.