Don't record to the camera - that's the best sounding solution. Get an audio recorder like the Tascam DR-40, DR-100, HD-P2, Fostex FR-2, Marantz PMD-661 or whatever you can fit into your budget.
Forget about using the Sapphire; it's meant to be a computer interface, not a production sound unit unless you want to use your laptop as the audio recorder.
Units like the BeachTek DXA-SLR "solve" the separate audio issue, but you are still, in the end, using the very substandard audio implementation of the DSLR camera, and they have present problems of their own.
BTW, the SE Gemini MK2 is a terrible choice for a production sound mic; it will be very prone to handling noise, is very heavy (at least as far as production sound mics are concerned) and very difficult to boom properly.
It sounds like you're music guy trying to get into sound-for-picture; film sound is a completely different discipline. You'll need to break a lot of habits and learn a new way of thinking and some new skills.