since it would defeat the point of running Graphene or Calyx
CalyxOS doesn't preserve the standard security model and security patches. It's not remotely the same thing as GrapheneOS but rather is much more similar to LineageOS. It doesn't reduce security as much as LineageOS but it does reduce security. You seem to have the wrong impression about what it provides and how it compares to GrapheneOS.
GrapheneOS and CalyxOS are much different. GrapheneOS is a hardened OS with substantial privacy and security improvements:
https://grapheneos.org/features
CalyxOS is not a hardened OS. It substantially reduces security. It regularly goes months not shipping critical security patches.
Compatibility with Android apps on GrapheneOS is also much different. GrapheneOS provides our sandboxed Google Play compatibility layer:
https://grapheneos.org/usage#sandboxed-google-play
Can run the vast majority of Play Store apps on GrapheneOS, but not CalyxOS with the problematic microG approach.
https://blog.privacyguides.org/2022/04/21/grapheneos-or-calyxos/ is a 3rd party article explaining some of the substantial differences between GrapheneOS and CalyxOS. It's a common misconception that they're similar. CalyxOS is far more similar to LineageOS than GrapheneOS. There are many other alternate OSes available.
https://privsec.dev/posts/android/choosing-your-android-based-operating-system/ is another article about privacy and security differences between alternative Android-based operating systems. Talks about other alternate operating systems including DivestOS. Unlike most content, these are based on real experience and technical details.