Yes.  Many Alcohol Burners etc. can be used with the Kettle kettle however you would need to check to ensure that your burner fits into the base of one of our kettles.
Internal Dimensions of Bases: Fire base of our Small Kettle is c. 10.5 cm in Diameter with a working height of c. 10cm before the chimney of the kettle starts to narrow.
Fire base of Large or Medium Kettles is c. 13cm in Diameter and working height of c. 9cm before the chimney of the kettle starts to narrow.
TOP TIP - When using your alcohol/gel burner, partially cover the chimney top of your Kelly kettle with a flat stone to retain the heat,  save fuel and speed up boiling time