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.

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.