With bribing BoDs now, it is really easy to get smithy hammers up to bronze, because these can be gotten using small bods that you get with a 0.1 smith then bribe up to the hammer you want. Given that these hammers are the most common, this is pretty useful.
Getting runic sewing kits is a bit tougher, because you have to use LBoDs, and you still get a LBoD only ~1% of the time. Again though, with bribery a lot more of these can be turned into what you need it to be.
So, it's not really a question of a raw number for smithy bods to get the lesser hammers - just bribe. You do need the proper amount of smithing to work with those ingots though. With tailoring, yeah, you'll need to slog through it a bit.