1. Ask Oade
2. There is the Hosa ODL-313, however in the past they had the issue, that they could not generate proper spdif headers that the mixpre does not provide either. I don't know if this has been solved in newer firmware.
http://socialsounddesign.com/questions/7156/connecting-mixpre-d-to-a-sony-p...
Although this might not be helpful, but I'd rethink investing any money in a HDP2 based system. It let me down in the past through various weaknesses.