Part of the ISO 26000 work program is to develop linkage documents between ISO 26000 and other important standards/tools developed by organizations such as the OECD. So far linkage documents have been published in relation to UN Global Compact, GRI G4, IIRC and the UN SGDs.
Today ISO 26000 PPO published a new linkage document between ISO 26000 and the OECD Guidelines for Multinational Enterprises. Hopefully those using one of these two documents will be inspired to use also the other document. The linkage document is available here.