Reliably? Heck no... There's only about a 10% chance of getting JUST 100% HLL with a copper hammer. I assume that to get both at 100% you'd need to use a bronze hammer, and then I bet your chances drop to something in the 1 in 100 range, meaning you'd need on averave something like 15-20 hammers per weapon.
No reason it can't be done, but ... yikes.