Wait, if alter egos are allowed and this is an alternate world does this mean we can app servants under the beast container as alter egos. Similar to Kiara?

(Just asking cause that class was made for servants that didn't fit into regular classification and yet had nothing to do with elder gods)

Im asking since the Alter Ego Catagory is generally the catagory for servants that don't fit classical definition (Sakura Five) or merely contain traits that make them beyond applicable for the original container (Okitan/Sitonai)