You can definitely score above 30 without orgo. A lot of the basic orgo questions in the BS section can be answered with a solid understanding of general chemistry. But you will have to be very strong in the VR and PS sections to compensate.
I wrote the MCAT without orgo, but I self-taught myself the basics while studying (e.g. stereochemistry, H NMR, IR, SN1,2 and E1,2 mechanisms, carbohydrates, amino acids). All my practice AAMC exams were 30+, but the first one I wrote before studying orgo I had a 10 on BS, and I missed only 1 bio question. So you will definitely be handicapped, but it is possible. I never scored higher than a 12 in BS in practice due to orgo.
I was in the same boat as you -- needed to write this summer. However, if I had the choice, I would wait till I finished orgo. It's stressful knowing that your hands are tied in this section -- you're leaving a lot up to fate (e.g. the 4 passages mentioned above).
Good luck!
As for physics, I would NOT recommend writing without physics II. Not knowing that stuff like the back of your hand will cost you a lot more on the test than not mastering orgo I (and especially more than orgo II).