You could mail this chap or one of the other sellers and see if they can scan you a copy.
Only use the 6x9 Makina II, but aside from lens details and any bellows compensation details would not the 67 manual at least cover the basics? Problem I've got is most of all the references I can find for mine all refer to the IIS to the IIIR. . .
Aside from the less than helpful "keep looking" and "monitor Ebay" that's all I can think.

There may be an outside chance in emailing Plaubel over in Germany.