Waiting for a different os to implement this... Doesn't seem to happen though...
GrapheneOS [Unofficial]
Welcome to the GrapheneOS (Unofficial) community
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GrapheneOS is a privacy and security focused mobile OS with Android app compatibility.
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This is a community based around the GrapheneOS projects including the hardened Android Open Source Project fork, Auditor, AttestationServer, the hardened malloc implementation and other projects.
I want other OSes to use this. It's far better than the other options. The only other OS I know of that uses this is ProtonAOSP.
Found Voltage OS...
It probably lacks a lot of the grapheneos security features though, like memory hardening kernel hardening etc. They don't even have an official website. Seems unprofessional
Eh still, if sandboxed google play is all that you are looking for then that is for you!