Well Android 11 will be a problem, we currently do not have the support layer "Halium 11" up and working. We are currently struggling with 9 and 10. Of course @edenmutt you are invited to help doing groundbreaking works here, but it might not what you have expected for porting. A lot of low-level bugs, and you need to familiarize yourself with the architecture changes between 9 and 11 at least.