oneworld - Economy class inventory when voluntarily downgraded DONEx

I want to go to Easter Island during the July 2010 solar eclipse as part of a DONEx. Of course, EF is showing all zeros for all inventories within 10 days of the event. If I chose to downgrade to economy class, would that book into Y or L? I believe that all domestic Chilean flights are Y or Y+ .

The SCL-IPC flights are specifically mentioned in the technical rule sheet on the OW site as booking into D D L for (first, business and economy products respectively), and the rules also explicitly sayFor flights where First or Business Class is not offered or available, passengers may travel in a lower Class, in the applicable booking code for that lower Class.

So the answer is L.