I would not worry about it.
Wood substrate blockages are another one of the internet forum bugaboos that have gained traction somehow.
Everyone is worried about them and people go to a certain amount of bother to try to prevent them. Someone invariably knows someone who knows someone who has a brother in law of a friend's niece who had a wood fiber blockage incidence.
However if you talk to vets, or if you talk to people who have been keeping snakes for many years, they are an extremely uncommon, even unheard of occurance. Our vet claims that every impaction she has ever seen has been caused by either incorrect temperatures of dehydration.
Let's put it this way - I've fed God knows how many snakes of different species and ages on various wood substrates for years without any issues. At this point I'm more worried that my snakes will steal my car keys and go on a booze-fueled road trip than suffer a wood substrate-induced blockage.
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