"Low Temperature Ignition of Wood" https://www.warrenforensics.com/wp-content/uploads/2016/06/P... :
> ignition of wood will occur under exposure temperatures of as little as 256ºF for periods of 12 to 16 hours per day in as little as 623 days or approximately 21 months.
It's also possible to encounter focused solar radiation due to various lensing effects.
Starlite: https://en.wikipedia.org/wiki/Starlite :
> Starlite was also claimed to have been able to withstand a laser beam that could produce a temperature of 10,000 °C
And, hemp is far more tensile than wood; which probably matters given the hazard of space debris.
There's non-oxidative types of decomposition, if you can reach high enough temperatures:
Hypothesis: the wood in a wood satellite will quickly dry out as the heat on the sun side boils the residual water out of the wood; and once dry, the wood will easily break due to space debris