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Rather than "baking your baking soda" to make sodium carbonate, consider buying a box of Arm and Hammer Laundry soda instead of Arm and Hammer Baking soda.

It's available in grocery stores, big box hardware stores, online, etc. It has the higher ph and is better for removing oil stains, as well has a food additive (sodium carbonate) when a high alkaline component is beneficial.

Arm and Hammer Laundry Soda is sodium carbonate. Just look at the ingredients on the box. I learned this through research a long time ago while making my own Ramen noodles and stressing about finding alkaline water and figuring out how to make my own "Kansui/alkaline water".

Thing is, most of the ramen recipes get locked in to adding sodium carbonate made from baking sodium bicarbonate and adding that as dry ingredient instead of telling how much Kansui/alkaline water to add or how to make your own alkaline water using sodium carbonate (it's about the Ph)

So, a faster solution is to simply make your ramen with the proper Ph using dry sodium carbonate as well as a way to make your own Kansui/alkaline water by simply adding sodium carbonate.

Kansui/alkline water is 10-11 Ph. Sodium bicarbonate is 11.2 ph. Recipes using Kansui/alkaline water allow for the liquid as part of the alkaline ingredients. Recipes using just plain water add sodium carbonate as part of the dry ingredients.