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I don't think there is any substitute for flushing and bleeding the fluid. No matter what fluid you use, moisture will still get in. You need to flush and bleed to get rid of any ingress of air, moisture, contamination etc.
I think that for 99.9% of people, a high temp fluid like RBF600 will be perfect. Dot5.1 fluids will also work as BMWs should have no problem with lower viscosity fluid. RBF600 will generally last up to 1 year, but IMO should still be partially flushed and bled after every 2 events or 6 months to be on the safe side. When your performance level gets up and you are using semi slick tires, then you should bleed the brakes before every track day.
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