Set up for A5 PUR / Perfect bound books!

Hi,

I am printing 4up on SRA3 sheets for my internal pages & 2up on SRA3 sheets for my covers.
Once they are printed & cut I have to make 2 separate piles.
The top cover on my SRA3 sheet only matches the top 2 A5s on my 4up SRA3 sheet the same applies for the bottom cover & the bottom internal pages.

Im just wondering if anyone can help me so I dont have to make 2 separate piles as it is very time consuming. Is there a way I can match both so I dont have to create 2 piles. i.e. any section of the A5s on the SRA3 sheet can match and of the 2 covers?

Hope this makes sense. Many Thanks!