Closer yes, but will take different hardware to achieve that.
In the meantime we will be building our OS around similar principles ⚡️
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That's great to hear, well done and good luck!
A short list of useful hardening features that make a serious difference for Graphene:
Zero-on-free with detection of write-after-free via checking that memory is still zeroed before handing it out again. 
Turn USB-C to power only (no data) when screen is locked.
Auto reboot after X hours.
Turn off WiFi/Bluetooth after X minutes after disconnect.
Hardened kernal.
Strong commitment to fast updates of drivers, kernal and OS to security patch level.
Dynamic code loading blocked.
More here:
GitHub
GitHub - GrapheneOS/hardened_malloc: Hardened allocator designed for modern systems. It has integration into Android's Bionic libc and can be used externally with musl and glibc as a dynamic library for use on other Linux-based platforms. It will gain more portability/integration over time.
Hardened allocator designed for modern systems. It has integration into Android's Bionic libc and can be used externally with musl and glibc as...
Features overview | GrapheneOS