1) If the language is something weird/inhuman then it has to be regained as a memory, but if it's an earth language and their made up backstory supports them knowing it they can know more than one language. Read here for info about fake Italy.
2) See above.
3) Most likely they would just give him a new organic hand, and the robot hand would be a regain. Someone could have a prosthetic sort of like that in this world, but they wouldn't be inclined to give him one.
4) That's fine. The brainwashing isn't supposed to be very perfect or solid in the face of scrutiny, so feeling certain absences and not understanding why is super reasonable. There are some characters already doing this, in fact.
5) If you're seeing a phone number listed somewhere then that probably IS the IC inbox. Because IC inboxes are actually mandatory.
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2) See above.
3) Most likely they would just give him a new organic hand, and the robot hand would be a regain. Someone could have a prosthetic sort of like that in this world, but they wouldn't be inclined to give him one.
4) That's fine. The brainwashing isn't supposed to be very perfect or solid in the face of scrutiny, so feeling certain absences and not understanding why is super reasonable. There are some characters already doing this, in fact.
5) If you're seeing a phone number listed somewhere then that probably IS the IC inbox. Because IC inboxes are actually mandatory.