i think it would be awesome to have a furnace or even a cauldren that acts like the artisan tables. they might require new tools though to properly work. it could have solid fuel and liquid fuel that is only used when needed unlike regular furnace (probably should be a toggle).

examples
furnace requires a fuel with inputs going from 1 to 2 to 4.
cauldron could require a fluid and a fuel then its inputs going from 1 input to 4 to 9.