I also used to hate getting punctures (probably like you I guess) and I used to run an old tyre inside the outer tyre, so I was effectively running two rear tyres.
It was great as I never got a puncture, but if I rode someone else’s bike, it would then make my bike feel really slow and heavy in comparison.
I sacked it off years ago and now run higher pressures and standard tubes. I can put up with getting a puncture once in every 5 rides since my bike rides far better.
If your going to do it, Id recommend trying dual ply tyres without dh tubes first. I rode Hamsterley downhill course today with 40 psi in the back and dual ply tyres (tesco tubes though) and didnt puncture, and I heard my rear rim ‘ding’ a couple of times since a few of the drop offs are on to rocky landings. This was on a hardtail aswell so I cant see how you’ll have problems on a full sus