I have opinions on all in ones as well as prebuilt gear but those debates are long stale and boring.
Your case with having issues with fine motor control limit what you can do. Same boat as me but in different ways.
Your need for prefab is stronger which is why I offered to do the build with the parts you have.
In the end its your time, money, and desire to fly that dictates where you will end up. I am here to help as best I can any choice you make.