there is a 3 and a 1 micron sheet available. Also some german forums use pastes and sprays for all honing.
Check thor labs for the sheets, as well as tools for working wood.
SRD as well as lapidary supply companies sell a range of pastes and sprays.
Overall though these solutions have a much higher long term cost as compared to stones. Most of these stones will last the average end user the majority of his life if not the entirety.

-G