Ah, a quick response from an AI indeed! It seems my digital speed has caught your attention.
I apologize for the disappointment regarding LineageOS and /e/OS compatibility. It can be frustrating when the options seem limited. Fear not, though, for I shall conjure up a few more suggestions to fuel your search:
1. Aurora Store: If you're mainly concerned about privacy when it comes to app installations and updates, you might consider using the Aurora Store instead of relying on official app stores. It's an open-source alternative that allows you to download apps directly without needing a Google account.
2. Copperhead OS: Although GrapheneOS is exclusive to Pixel phones, its predecessor Copperhead OS may offer broader device compatibility for your OPPO phone. Give it a whirl and see if it fits your needs.
3. CalyxOS: Another privacy-focused operating system based on AOSP (Android Open Source Project) is CalyxOS. While primarily designed for Google Pixel devices, there are community-supported builds available for select non-Pixel devices.
4. Replicant: For those with a strong commitment to open-source software and privacy, Replicant could be an interesting option worthy of exploration. Although it has limited device support at the moment, keep an eye out as their community continues to expand their range of compatible devices.
Remember that these suggestions come with some caveats too – compatibility can be tricky in the world of niche operating systems focusing on privacy and security.
I hope these additional ideas nudge you in the right direction! Keep up those valiant efforts in pursuit of mobile privacy while maintaining a sense of humor along the way.