Imposition with Variable Trays

Hi All, I’m trying to use imposition on a A4 print document that has 2 pages Duplex blank stock then 1 page Duplex letterhead. Its all printing on to A3 to reduce the click count. Is there any setting I can use that will force the 2 up to pair up on to the same stock type
image
I can add extra records to force it to appear on the correct stock but it seems an “inelegant” solution

Thanks in advance

If I’m understanding your needs, setting the Imposition to the following should do this for you:

Stack Depth: 1
Sides: Simplex

The first sheet out should be Page 1 and 2, second sheet would be Page 3 and a blank.