When you are playing as a killer in a custom match i would find fun adding the opportunity to play with other killers so you don't have to buy it to try it. Only non-licensed killers though...
Should the killer be able to choose the HEX totem location? Like a map shows up on the screen with red circles, under the map there are the HEX perks ex. Ruin you hold ruin and put it on a circle, and it spawns there. Or the killer going through the map in game and calls the entity to light a totem of your choise.