> Depending on how you look at it using another's entity's cryptographic key to sign something that then "pretends" to have been produced by that entity might classify as forgery.
Perhaps, if you were attempting to make that claim to an actual person in a commercial context, deceiving them for personal gain. But in the context of "pretending" only to the hardware? Unlikely, as hardware has no standing in court. Even for-profit distribution shouldn't be an issue so long as it's clear to the human recipients that the signature is only present to fulfill technical requirements and the item wasn't actually produced by the other entity.
Perhaps, if you were attempting to make that claim to an actual person in a commercial context, deceiving them for personal gain. But in the context of "pretending" only to the hardware? Unlikely, as hardware has no standing in court. Even for-profit distribution shouldn't be an issue so long as it's clear to the human recipients that the signature is only present to fulfill technical requirements and the item wasn't actually produced by the other entity.