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The twist beam won't have a huge effect on where the trailing arms pivot because the bending stiffness of the trailing arms is pretty high. Just think of the twist beam as an anti-roll bar that can't be disconnected and think in terms of both rear wheels moving together. Measuring the wheel hub centre, spring mounting point and the trailing arm pivot point leads to the usual relationship between spring rate and wheel rate.
I don't know if you're going to the extent of calculating anti-roll bar rates but the twist beam itself is a little tricky to get right. It has an open section and you can look up the torsional stiffness for that in standard text books. The problem is that the end effects where the twist beam joins the trailing arms mean that the formulas will underestimate the real anti-roll stiffness.
Hope that's some help,
Scott
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