I work a 4 on 4 off roster and as unlikely as it sounds Saturdays and Sundays are sort after work days because the OT rate is much higher then the weekday shift loading. I would not have believed it if this had been suggested to me 1 year ago when we started our shift. Weekdays are better days to have off anyway as everything is open and recreational venues are less crowded, I see the kids after school. So try your SDA on the 4 by 4 shift and let it work itself out. It will only be a problem 4 weeks in 8.
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Curiousity killed it