I usually push all my weak weapon's grade materials into training. Like, I have a legendary armorsmith, but a sub-par weaponsmith, so I'm using a lot of copper, bronze, and silver to make weapons to get his level up, because I let him enjoy some steel or adamantine. I've also started studding trade goods. Like, a totem studded with 15 different kinds of metal. It gets rid of skulls AND gives me tasty trade power.
I also realized that, pretty much, adamantine is the only non-renewable resource, at least so long as you don't have a king. You can always request a load of steel from next year's caravan. Or better yet, request bars of steel, iron, and pig iron, and request rocks of magnetite and limonite, and you've got a good bit of metal there.
I personally have trouble with non-masterwork things. I'll set a forge producing full sets of armor on repeat, and only remove one item if the last production was masterwork. So, I've got a LOT of Exceptional steel armor sets. I should mod in an armor display that requires a head, chest, hands, legs, and feet type of armor for construction. Like those displayed suits of armor in English castles. With exceptional steel armor costing upwards of 3k each, even for a single glove, that could make some expensive rooms very quickly.