You could try either:
1-Get a piece of 1 x 1/2" or 3/8" thick aluminum stock (whatever works), cut it to size, and bolt it to the pot to form a new lip
2-Find an old SJ bowl, use a grinder to cut off the lip of the bowl, and JB weld it to the pot to form a new lip
If neither works, you can always buy a Vasconia.