Nashar states their Moustache bars fit barcons. They show road brake levers on them also. I am almost positive that MTB brake levers are a smaller diameter. If you ordering from Nashbar, then just buy a set of their road brake levers. They are under $20 and you can have them shipped with the new cables, handlebars, tape and stem you'll need. Good luck it sounds like a real fun project.
Tim