You can get plates to use under aluminium pots, although I don’t think they are as good as a decent pot. Preserving is a bit more complicated (and a bit of a niche issue) as it involves a very large and heavy pot, which is kept at high temperature for a long time. So there are issues with the size of burners, whether the stove can support the weight, staying hot for a long time, and maintaining a consistant temperature and not fluctuating. I’m currently looking into a portable commercial solid-plate electric burner. It’s pricey, but if it works then I won’t need to worry about the future gas price rises changes, and will have the ability to take it outside in hot weather to avoid overheating the kitchen.