Heat Metal to work iron without a forge?

[MaxWilson]

Heating metal in a forge only gives you 1 minute or so of workable heat before you need to put it back in. A skilled blacksmith could absolutely turn an iron bar into a spear head during that time. You won't get a longsword or armor out of it, but you should be able to make some basic weapons.

This argument is good enough that I'd consider it, maybe do a tiny bit of Googling on forging, and probably allow it for spears and other simple items.

The Googling is just to check that I'm not overlooking anything.