I have not played DF adventure mode in ages, so I don;t know if the fort mode damage system is in adv mode as well. (As somebody mentioned on github, fast travel used to heal all injuries).
But you do realize this is a bit stupid right? A DF like system in a future world like cata means you go through a stack of characters as fast as a prostitute goes through a stack of condoms. When your dworfs get seriously wounded they are probably infected or lose limbs, or are useless forever. And without help most of them would die. The only reason that it is fun is because you have a lot of dworfs. And you care about the fort, the simulation, the !!fun!!. A DF like system would just kill your characters pretty quickly.
‘The Turret hits you with his smg burst. It rips through your clothing, your leg bone is smashed, your leg tendons are cut, your spleen is ruptured, your intestines are bleeding, shots bounce of your skull, you are stunned. You are bleeding.’
While DF is a great game, it just would not work in CDDA to have the same system. Now if you would implement multiplayer, or good npcs, then it could work. But if your new system depends on something that is very hard to implement. You should reconsider.