I was asked a really good question on Monday about if the Diatom pattern would lend itself to being modified to be used with AccuQuilt dies. I spent some time that afternoon going through all the instructions in the pattern, and Block 11 is the only block that likely has unusual enough sizing that it might not be realistic to make using AccuQuilt dies.
For anyone else needing alternate cutting help (for whatever reason), you can read through the AccuQuilt Accessibility Information PDF I created for the Diatom QAL here:
As I have noted in the PDF, I think it would be easy to make a second star block of one of the other versions or choose to make fewer blocks for a slightly smaller finish. If you do cut with AccuQuilt dies and choose to join the quilt along, I would recommend keeping the PDF as a reference as it will hopefully help reduce the time and effort needed to re-design how to make each block work best for you.
I hope this information is helpful for those who need it, please let me know if there is anything else I can do to answer your questions about the Diatom quilt along, and know that I will be happy to help along the way during the quilt along, too!