Incinerating in an electric furnace isn't advised without doing it in a chamber that is sealed from the elements.
kanthal or nichrome wire builds an oxidation, if you create a lot of sooty smoke, you run a risk of creating a reducing environment. This oxidation is self limiting, but if you change the environment to reducing, you will reduce the oxidation and it will flake off, then the element will oxidize again, and reduce, and oxidize and so on. This greatly reduces your element life.
There are ways around it.
Personally, I've got a small stainless chamber that I can put in a kiln. I then have a stainless flexi hose like you'd use for your gas line hookup. This vents the smoke outside of the kiln. Once it is done pyrolizing off the volatiles, you just open the chamber and let it oxidize everything.
I'd much rather just have a gas incinerator.