I'm trying on and off to do the same at the moment. Part of my problem as well is making it as accessible as possible for my wife who will simply just not use something as soon as there is even a minor amount of friction.
I tried initially to use steams big screen mode to have everything bundled together in an easy interface. I ran into problems with that though and how the likes of Netflix was basically just a browser forced into fullscreen. It worked great until you wanted to exit tk change services which just didnt work as it should (using a controller or a remote).
I want to try out plasma big screen to see if that can provide the easy to use interface because as it is right now I just have a browser open with the few services we use ready to go but navigation just is not fun when using an air mouse to try and hit tiny ass buttons.
I dont want to use kodi as I have always thought it was trash ans when I have used it before my wife flat out refused because of the interface.
So no suggestions I'm afraid but I will be watching this thread to see what other people have come up with to solve this problem.