How would you update items in a batch?

I need to update a list of items from a SQL query. Basically, I need to run a query that will return the items A/R Invoices without 2 UDF's filled in, and get the values for those UDF's from the query. (The values of the UDF's are the Customer Equipment Card number and the Contract number. Finding these values isn't the issue).

So that's my question: How would you update UDF's on an Invoice using B1 functionality? I'd prefer to avoid using a DTW if possible--the best option would be to have it auto-update every 24 hours or similar.