Nickle copper alloys require coke, and coke requires iron and tends to be something you only do when transitioning to steel. So it seems imbalanced to be the same stats as regular bronze. Feel like they should have the stats of iron with the durability of bronze, as a half way step since it can be cast rather than forged.
Or is there an easier way to get coke than putting coal in a coke oven. Or possibly a different fuel?