A friend asked me recently if I could use a g diaper insert inside a prefold for extra absorbency at night. I didn't have a cloth gdipe insert so I used a microfiber BG one instead. It's the same size and shape but you should NOT use it against baby's skin in real life because microfiber can irritate.
In any case, the idea had honestly never occurred to me so I tried it out. It worked great! It was a little extra bulky but might save you from nighttime leakage!
(Shown here: GMD prefold, Snappi fastener, BG 4.0 insert, Thirsties Duo Snap Wrap in Ocean blue)