ForManaga:Yeah but as everyone point that out they are still married, Yes as Apsara they can marry another man if he is Mortal but for the story it would NtR didn't it?
My thought don't add Rambha as she was the wife of Nalakuvara who was the son of Kubera where she was forced by RavanaUrvashi the wife of PururavaMenaka - Vishwamitra
Don't add rambha otherwise it would be an surekill ntr if u want the ramayanam in this story the start of that story is all because ravana rapes her and get cursed by his own son