Hi, in terms of look, you should definitely try Nova Launcher. It's paid (the full version), but worth it: with it, you can make your home screen look almost exactly as N9's.
Then, modify your app icons with MeeGo-Harmattan Theme and MeeUI (also paid if I remember). You can get something like in the screenshots below.
Samsung A3 does have an always on display, it's quite cheap and it's small
A nice app to have offline emails is BlueMail
https://ibb.co/hfJgC7
https://ibb.co/kuy3QS