For anyone running or interested in running GrapheneOS: I thought it would be a good idea to do everything without installing Google Play Services. I was able to install & use ~90% of what I need, but Wallet of Satoshi apparently needs Google Play. The upside is that you can install the sandboxed Google Play from the GrapheneOS mirror & then remove all permissions including access to network & sensors (essentially completely disabling it), & Wallet of Satoshi will work with no issues. Hard to complain about that 😌