Don't use Live View with just the lens and no filter. You will probably nuke your sensor. If you have to tape some welder's glass over your lens, but that may block too much light for fast exposures. Mirror up is probably fine due to the short exposures involved but you still have to compose somehow. You are basically turning your camera into a giant magnifying glass pointed at the sun. Something to think about. I would try to reduce the amount of light somehow given the magnification involved. You are going to likely need to use live view to get the best focus result. Your shutter speeds should be relatively fast even with a good ND filter so I wouldn't worry about mirror up so much. I would set it up in live view and then trigger with a remote. As long as you stay in live view the mirror will be locked up and you shouldn't get a lot of shake other than the shutter.
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