How to Find US Hardwood Sawmills and Logging Companies Using Custom Metadata Filters

Hey everyone - I have a specific ask from a client. I need to find sawmills/logging companies in the US that either import or produce hardwood (vs other kinds of wood). Clay gets kind of close but many of their accounts do not meet this specific criteria. I've thought about having an Agent check all of Clay's results via the domain, but wondering if anyone has faced this kind of issue where you need to find a sub-category of accounts on a custom metadata