Atmos Speaker Wall Plates: Is there a Cheaper Way than Custom Keystones?

I'm installing Atmos 5.4.2 in my basement remodel. However, I'm perplexed that no companies have created atmos specific speaker plates. Without purchasing a mismatch of 7.2 or 8.1 plates, I've seen other users suggest building your own plates with keystones.

After getting what I need in my cart for a 5.2.4 setup, $87!? Is there a cheaper way? I'm honestly looking at this as a business opportunity to make pre-made Atmos plates available with printed labeling... Would anyone buy? lol

https://preview.redd.it/0p0k4otxnbie1.png?width=925&format=png&auto=webp&s=ed91dc7e46ffa234273be9a84a2abbaf487846e7