is there some method to hack bauxite stones into my fortress?
Use dtil to change some useless* mica or orthoclase or what-have-you vein into bauxite. Or even better, find some 'rare' colors like pitchblende, mine all but one, change it to bauxite, copy the bauxite tile, paste over a 20x20 room, mine it, then change all bauxite back into pitchblende.
Or, if it works, just enable hematite to be used as a normal stone and lock in a mechanic with a small supply to make mechanisms. I don't know if they'll be iron mechanisms or hematite mechanisms, though.
I'll try and see.
Edit: Hematite mechanisms. Bleh

And yes, they do melt.
*useless stones are included in
this list. Oh and I can't write.