How slow do you want the power supply ramp up? This is the absolute worst case: R1=R2+-0, R3=R3+-0, C1=C2+-o, Q1=Q2 perfectly, no noise except a bit of math noise due to floating point math, and I am ramping up V(cc) very slowly. Anything that unbalances a "real" circuit makes it even more likely that it will start oscillating. Note it starts right at ~2.8s (when V(cc)=~600mV, regardless what I do to the circuit (within reason).
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If you can build a multi that doesn't start when power is applied, I want to see it...