I bought the kettle pizza insert with the pizza stone and surface searing accessories. Works great. Also recommend the remote temperature monitor to track the temp of the stone.
Sent from my iPhone using Weber Kettle Club (https://siteowners.tapatalk.com/byo/displayAndDownloadByoApp?rid=91018)
For anyone shopping, be sure to check out OnlyFire. For $150, you get a complete kit that is built from heavy gauge stainless steel. The design has a very low ceilings to ensure that toppings cook evenly with the crust and does not require an additional accessory like the KP.