I don't know about the new Albastache, but the old Moustache Handlebars generally require a 3cm shorter stem than your normal road bar length. For me this works out to 12 or 13 for Albatross, 10 for road, 7 for Moustache. According to this theory of the original design I think you'd be good with a DirtDrop, assuming the Albastache reach isn't drastically different.
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