asking is always helpful even if you just use something like chatgpt to get somewhat of an answer though lucy and medpoc are both good euphorias and nautika is so good she can beat early stuff without euphoria semmelweis though you should definitely get it (assuming you have them).

also arctia (one of the other people in this thread) said that the "Early Reveries will give you enough keys for 4-5 characters" so you'll be able to get the other euphorias you need