Hi Josh,
Thanks! I tried this approach and it works fine, except that I'm having a problem with importing numeric columns with some NA values via labkey.importRows. If I convert this to a character and create the list w/ type=character, it's fine. But, I do need this as a numeric value. Is there a way to import numeric columns with NA values?

Error in labkey.importRows(baseUrl = "https://labkey-dev.roche.com:8443/labkey", :
  HTTP request was unsuccessful. Status code = 400, Error message = NaN is not a valid value for column 'cv'