I have access to quantities of wood shavings & sawdust, which I'd like to rot
down to augment my soil. A fair proportion of it is red cedar which has the
reputation of being especially slow to rot.

I wouldn't put wood on my regular compost pile as that would slow things there.
I'd prefer to avoid using strong chemicals on the wood, but still find a way to
encourage the rot.

Any (polite) suggestions?