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If the honing angle is much lower than 15 degrees, you might want to make a brass shim that can slide over the spine. That way you get a better angle. It's what I did for 2 of my razors because the...

Given the extremely shallow honing angle, how do you plan to hone it. Will you use a shim?

Coal and charcoal should be available in most DIY and garden centers.
Charcoal depends a bit on the time of year (BBQ season) but coal is available the year round in most places I can think of.