Chances are, you will still have tissue left in a year. Burying actually protects the remaims from the elements and insects.
Your three best insect scavengers are ants and fly larvae for wet tissue and dermestid beetles for dried out tissue for specimens left on land.
The colder weather will slow the insect activity.
Depending on burial depth, ground moisture, temps, etc., the brains can remain inside the skull for much longer because the are further protected by thr skull.
Maceration in water will be stinky but quicker than burial and you won't risk damage from boring insects or attempted excavation by scavenging carnivores.
Add some oak leaves to the water, or even tea so as to get a soft tan/light brown stain collor on the bone, if you like.
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