Very, Very few mods include anything like this in 1.16.4, sadly. And some of them that do, dont include one that actually works

If you're worried about "Oh, another autosmelt mod" being a concern for people, you could maybe try to make it disableable?

I could do all of this but honestly in the new day and age of data-driven smelting, it's nowhere near as easy to implement as it used to be. For this reason I'm unfortunately going to close this. Thanks for the feedback though! If I have a large amount of free-time in the future I may work on doing just this 😄