So I moved to Dhizuku. It's a bit hard to setup, but once I'm done it's felt like untethered jailbreak - I don't have to complicated dance to start Shizuku now. Dhizuku basically make your phone a company phone, except it report to you. To setup a "managed main profile" you'd need to remove all accounts visible in Android account system and type a long ADB command so I don't think it can be maliciously done.
I suppose this will be how we'll use F-Droid in the next year for enthusiasts.