Q: Are there any good chemical treatments to speed up and/or assist with the composting of dried leaves?

A: Sure, add nitrogen of some form to the pile.

My rule of thumb is 1 cup of 10-10-10 per pile with piles averaging three feet high and four feet wide. Stir the fertilizer in a bit and spray the leaves lightly with water as you stir.

Bacteria and fungi will have a great time eating the leaves.