I think there should be a keyword that lets you put as many plot twists, locations, and equipment as you want in a deck. I want to call it 'common', but I think UDE would leave that open in case they want to reference rarity. Instead I'll call it 'frequent.' These cards would have to be weak, but it would still make deck-building more interesting. The way I see it, everyone has a knife in their house and there are millions of guns out there, so how come only 4 of my characters call wield a knife? There are tons of street corners, hills, and crossroads out there, and some events happen all the time. Here are some suggestions.

1 Hail of Bullets
Plot Twist
Frequent
Flip or discard X plot twists named Hail of Bullets -> Stun target character with cost less
than or equal to X. No other plot twists named Hail of Bullets may be played this turn.

1 Firing Blind
Plot Twist
Frequent
Target player loses 2 endurance.

1 Crossroads
Location
Frequent
Activate -> Look at the top card of your deck, you may put that card on the bottom of your deck.

1 Mini-Mart
Location
Frequent
Pay 1 endurance -> Replace Mini-Mart.

That one would be pretty broken in a Reservist deck.

0 Bandage
Equipment
Frequent
KO Bandage -> Target character gets +1 Def this attack.

0 Knife
Equipment
Frequent
If equipped character would do breakthrough damage, he does 1 more breakthrough damage instead.

I agree with all of your cards except Firing Blind, I think that it has way too much potential for abbuse.

later