Hi Iain,
While I cannot offer any substantiating evidence, I feel compelled to think of these thuluth covered weapons coming from the Sennar regions with many of them entering there from Red Sea trade. It seems quite likely that as they entered the trade routes westward, these dukari imbuements were probably stamped in over the thuluth in the key locations and configurations by armourers in the route posts.
As you note, the presence of these moons does not signify a European blade, in fact as I once noted, these paired moons seem quite unusual on European blades, though they are certainly known in some cases.
All the best,
Jim
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