I thought the ideas that
@FestitaMakool and
@Svar came up with had a lot of merit so I decided to modify the sanding sheet for a DTSC sander so that it would be compatible with the DX 93 (RO 90) paper.
Here's the sanding sheet for the DTSC is cut into 2 pieces. You'll get 3 sanding corners in one and all of the dust extraction holes are in the right place.

Here I attached a DX 93 paper to the already cut DTSC paper, you'll also get 3 sanding corners, however none of the extraction holes in the 93 paper meet up with the extraction holes in the DTSC pad.
![Sad [sad]](https://www.festoolownersgroup.com/Smileys/default/sadsmiley.gif)
The green circles are where additional extraction holes need to be added.
So from my perspective, if you plan on going through 10 or fewer DTSC/DTS sanding sheets then a scissors and cutting the sheets is the simplest move forwards.
If however there will be a lot of sanding sheets that need to be cut, then I'd probably go for the hybrid DX 93/DTSC approach and then just make a hole punch for the DX 93 paper.
