Very interesting!  I had not heard of that before.  In some preliminary testing, the datalength of the field is 4 (why not 1?).  Still investigating.

My other thought is to create a dynamic SQL to insert the fields.  First pass was to insert and then update based on if any fields were NULL.  But that lengthened my time from processing ~ 40k messages from 25 minutes to > 90 minutes.  Looking to see if I can build an array to track which fields needs to be inserted vs hard coded to ''.