Interested in getting ideas from folks on the best approach

Hey, I think you should use the import from Salesforce list enrichment in a Clay table to pull in your companies.

Then run enrichment on those companies - you'll need the company name and domain to pull industry classifications. You could use Clearbit, Apollo, or other providers. Or use OpenAI to classify based on company description (just include your Salesforce industry picklist values in the prompt so it maps properly).

Once you've got the data, push the updates back to Salesforce using the lookup/update record option.