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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?
Not sure. I use mine on a kamado bbq. What ever you use it on needs to have inlet vents that you can block and fill with the fan so it's now regulating your air intake and out let vents that you can adjust. What type of vents does your kettle have?