Eagle Warden dudes and goods that play together. Perhaps with a trait that says "You may boot your Shaman instead of paying this card’s cost" (a la Bacillus Pasteuria) or even "You may boot your Shaman while playing this card to reduce it's cost by your Shaman's skill rating". This would mark it as EW but easily allow it to slot into other decks (especially if the cost is cheap).
Design space has already been set open for First People to play around with (Mystical) goods / weapons that improve their bullet rating. Consider the following two cards:
Shootout Spirit 7, Boot: Choose a dude. Remove all bullet modifiers from that dude, except from their attached Weapons. That dude cannot leave the shootout via card effects this round.
Shootout: Choose a dude. For the duration of this shootout, that dude ignores all bullet modifiers except from attached goods.
The problem is, many Wardens / Spirits actually get bullet bonuses from effects these cards would actually turn off(!):
Gene North Star
Joseph Dusty Hill
Strength of the Ancestors
War Paint (not explicitly "EW" but worth mentioning)
My wishlist is thus two-fold:
1) Create a Dude / Spirit / Totem who "Peacemaker's" (protects) bullet bonuses from your own attachments / card effects
2) Create Mystical / Non-mystical goods or weapons that grant bullet bonuses (+1, +2, become stud, etc...) for EW dudes specifically / especially