I am looking to build a basic phone for those who don't need more. The people who have Android phones from 6 years ago that are insucure and out of date. Or people who have the latest device with 4 apps installed and no concept of how to use the home screen or widgets. I have a launcher system lined up, and am working to build out a hand curated app store that does not require an account or a credit card. What I need is someone who can build the Android ROM itself and keep it updated. The OEM phone this will be based off of runs 8.1 GO at the moment. I want to strip away multitasking completely, strip away the status bar and notifications, and bring it up to Android 9.0 if possible. This reference phone is very low end but I don't want the few features it has to feel low end. I want to strip away all of the background stuff to ensure that even with 1gb of ram everything is as smooth as butter.