Only a qualified gunsmith would be able to tell if the barrel is thick enough to be threaded for a choke tube. That will cost $$. I'd cut back just enough to remove the full choke. A dedicated slug gun, especially a bolt gun, would be cheaper. I've taken plenty of deer back in Wisconsin in...
You're welcome and good luck. I just sold my stainless 195 series stainless to my son-in-law this afternoon. I miss it already but also realize I have life time borrowing rights!