It really depends on what gear you already have access to. Obviously if you have a couple pieces of Usukane already, you're going to have a bunch easier time reaching Greater Colibri accuracy cap even without leg gear than someone who doesn't have any Usukane. Enkidu, Add-on gear, AF2, and HQ Sniper Rings determine how you can shift around your accuracy to accommodate for a piece of gear that has other great stats but no accuracy.
My WS set for Stringing Pummel, without including Usukane or pieces without accuracy would have been as follows;
Anwig Salade: Accuracy+25 Attack+7 (counting the 4 STR)
Enkidu's Harness: Accuracy+10 Attack+12 (counting the 5 STR)
Enkidu's Mittens: Accuracy+7 (counting the 4 DEX)
Faith Torque: Accuracy+6 Attack+7
Diabolos' Earring: Accuracy+3
Hades' Sainti: Accuracy+7
Potent Belt/Life Belt: Accuracy+8 Attack+1(counting 3 STR) or Accuracy+10 (depending on enemy evasion)
Pantin Babouches +1: Accuracy+5 Attack+2 (counting the 5 STR)
As for rings, we'll say 2x NQ Snipers for the sake of this thread; Accuracy+5 x2 = Accuracy+10
That's +81 Accuracy not counting pants, and before food with fairly average gear for any decent PUP. Not including Ancient Torque, Usukane set, Hollow Earring, HQ Sniper Rings, Shenlong's Baghnakhs, and lolNinurta's Sash.
I'm sure anyone with this kind of gear set or better, can get away with putting anything they want on the add-on pants and still perform very well at Greater Colibri camp.
The thing is, nearly ALL of PUP's gear is rare/ex, so doing well at this job is directly based on your performance throughout the game as a whole.
**edit**
For clarification, you need 409 accuracy for Greater Colibri camp.
PUP's base H2H skill: 225
With merits: 241
241 skill's equivalent in accuracy = 216
DEX's accuracy adds at least 33 for; 249
If you sub DRG, that is another Acc+10 for: 259
Crab Sushi adds (before gear) something like 13% for: 292
After adding the above gear you'll get 259 + 81 + 13% = 384
That is really good for an average gear set, only 25 accuracy off of cap (food effect makes less actually needed.) You can upgrade a couple pieces of gear and/or add in pants with accuracy (like AF2 with acc+5 or volunteer's brais with acc+6) to hit cap on accuracy for the highest level Greater Colibri's.