I would level up all to 50, then (or while you level the others) meld one to get the artisan's spectacles that are for all classes, and save the expense on the head gear for the rest of the classes. The Ixal gloves are not optimal but are ilvl70 and are for all classes, save money on hand gear too.

Try to save the melds if you don't need them to craft the items you usually craft.

Then you can try and get the ilvl70 weapon for your best class. Soon we will see what 2.4 brings for crafters.