So I'd just like to throw a bit of my own speculation out there as it relates to the Arkenhammer and Carneymancy. I'll try to keep this organized, but I might ramble a bit.. anywhere, here it goes:
Taking this from a wider viewpoint that each Faction seems to have an overarching 'theme' I notice a few different things in support of a clown or carney theme being played out with the Plaid Tribe, Stanley and the Arkenhammer.
Plaid Tribe --> Clowns and carnies in general are often decked out in plaid of clashing patterns and colors.
King Saline IV --> Obvious reference, Saline I.V. drips, being water with a sodium additive. Taking this a bit further, Seltzer Water, carbonated water often with a sodium additive, when used in a seltzer bottle to spray someone in the face is a classic physical comedy prop. There are some other things here, mostly in connection with wiki speculation I.E. "bears a striking resemblance to King Friday XIII from the Mister Rogers' Neighborhood" which brings to mind handpuppet shows like Punch and Judy
Stanley --> Besides being a Tool the only things that stand out in my mind here are a possible association with Stan Laurel of Laurel and Hardy fame, and the KISS facepaint thing being comparable to clown or stage makeup in a general sense.
Arkenhammer --> The primary argument for this tool being shockmancy associated is the lightning control, while a whole host of possible behaviors of the hammer have been speculatively applied to carnymancy. What I'm surprised has never been mentioned in favor of a lightning like effect being an aspect of carnymancy is this little number: Joy Buzzer
which is often employed by.. you guessed it, clowns!
Anyway, that's about it. Just needed to get that out of my system.