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It should work in theory as a kettle is basically the same as a kamado but a smaller volume (although metal and not ceramic), not sure I'd want to be drilling a hole in a new bbq though, have you seen any good examples of it working online?
I got a kamado because it's great for grilling and smoking but they're £££ and not worth it if it's only gonna be used a few times a year? Although (in theory) you'll never need to buy another one. Maybe you'd be better off buying a cheap smoker than drilling your bbq?
It has vents but they're not easy to attach something to. From a bit more reading up it's awkward to use with a weber kettle and the recommended method of installation is to drill a hole in it.