Excellent idea about the two soaker system.
My DD is a super wetter and until now have finally settled after trying everything on the market to using a Poochies Bedtime pack and wool soaker.
This is basically a hemp nappy with lay in booster plus a microfibre and three fold booster on the outside with another hemp booster snappe onto the outside of the nappy. I add an extra internal booster but still get a really wet soaker occasionally so a two soaker system would be my PERFECT night nappy system.