I was thinking about the implants last night(trying to go to sleep), and came to this conclusion.
Doctors get "mechanical" eyes and ears. They insert them into the head via surgery. You first need to put the victom(or patient) out with aesthetics, then take out their eye/ear with the required tool. The doctor then puts in the eye/ear, and implants it with the required tool.
This does two things. One, it gives doctors more things to do. Two, its a way to cure blindness/deaf(ness?).
The aesthetics part is to prevent the patient from doing it to himself(mostly the deaf part, being blind kind of prevents you anyway, unless you carry spare body parts around...).
Now, from here, you can add whatever greifer parts you want. Cutting out the eye(which is a lengthy process), causes you constant bleeding and dieing is an option after 5 minutes. Without aesthetics, your instics tell you to prevent the doctor from cutting your eye out, preventing the precedure from happening"Dwarfy Mcblind resists cutting of eye". The tool to cut the objects can be a surgical knife, and the tool to put them back in could be a surgical laser or something. All of the tools can be in medical storage, concidering if a traitor gets a hold of a surgical knife...
Oh, and just to not have blind/deaf people running around, when you examine people, it says "Mcdwarfy is as if unaware of his surroundings" or something like that.
I can imagine severed eyes would create some funny scenes. We need a mess hall. XD