Making a Clockwork Spring

Using the traditional process can be, but the material is not spring steel as you said.

Beryllium bronze is the material that can realize the performance and process requirements you mentioned.

Beryllium bronze can be used to make larger springs, because it can be welded together in a circle, and then finally made into a large spring from small to large, which is superior to other spring materials.

You go to the Internet and search for "beryllium bronze", from suppliers, prices to manufacturing process.

Your question is not at all tedious and boring, but the advanced idea of people with heart, praise one!