Least the last time we combined we did this:
Mix all Dead wizard tokens and choose from the pool. Only one omitted are ones that refer to gangsters if you aren’t playing gangsters.
Legend stack: practically all except remove any Gangbangers treasure that refers to gangsters if not playing with them.
Starter deck is still being discussed since there are options.
Main deck: haven’t found too much of a need to remove any card so far cept maybe Destiny’s child. No one in my play group likes it lol
Also why does gangbangers have a similar icon with ESA2? It made it challenging to separate Gangbanger treasures.