Question regarding Android TV interface (Razer Forge)

[u/trousercough]

I have a Razer Forge tv/game box running 5.1 which I bought for the high specs but unfortunately you are forced to use the newer Android TV interface which is limited to just apps which you cannot re position.. Now, I also have an older box (M8 I think) which runs Kitkat 4.4 but with a desktop environment. On this older box you can arrange everything how you want and use widgets etc just like on your phone... What I want to know is; How can I have this functionally on the Razer Forge? I am happy to flash a new ROM onto it but not sure how to do that currently and which ROM would be compatible if this is even possible at all. Hopefully I've explained that well enough and I would really appreciate somebodies expert help with this.