Mad idea on having 2 tubes inside the rim.
When fixing a flat don't rush it or get frustrated. If you start making mistakes you take longer, your hands get colder and it becomes a pain in the a*se. I prefer just to put a new tube or an already patched tube in rather than fart around try to patch it on the road.
Booger1 how the hell do you find the hole and patch it in driving rain or sleet? I picked out a small wire that caused the flat the other day and the hole was tiny and I struggled finding and patching it under a lamp at home let alone in the dark or overcast conditions on the road.