thank youLike @smitty_r51 said, I went with a single spare. Followed the advice on here and bought a tyre pressure monitoring system so I'd take better care of the tyres I was using and a tyre repair kit.
My vehicle has quite a few pinstripes so concentrating on the best line to take care of the tyres, not getting bogged, and keeping it rubber side down, comes well ahead of dodging scratchy branches. I'm sure watching out for scratches brings people unstuck in other areas.
I used one of these.
https://www.repco.com.au/en/4x4-adventure-escape/travel-touring/air-inflation-tyre-repair/repco-12v-tyre-pressure-monitoring-system-rtpms4s/p/A5524543?rgfeed=true&cid=google-shopping&utm_source=google&utm_medium=cpc®ion_id=100252&gclid=CjwKCAjws8yUBhA1EiwAi_tpEUNUaD14Ya2F81AO8DhnwkA5NMPv0-s8CJvSvvybCIwElWSe1GQpuhoCiXYQAvD_BwEIt was excellent while it was working, but the pressure outside 25% of setting alarm stopped working half way across the Simmo. Repco replaced it. Replacement working so far.
I have a tyre pressure gauge, similar to what you shared