Dwarf fortress, using magma kiln at magma sea rather than at surface [closed]

I embarked on a site that does not have a volcano. I have access to clay. so want to use a magma kiln to make clay crafts until I find coal.

those who perfer full vanilla game play, do not look at the spoiler below:

I use DFHack's "fastdwarf 1 1" command and all my dwarves have Legendary skills via editing the raw file (cheating), so hauling clay, crafts, or magma long distances is not a big issue.

I was thinking of using the magma sea to fuel the kiln. So I was considering bringing the magma up to the surface for the fuel + pampering tree hugging guests killing elves and goblins. Or would it be easier to use the kiln at the magma sea? I am asking this of anyone who has experience building pump stacks [for magma].

So is better to make kilns at magma sea level or at the surface?