You've tried plasma mobile? All apps are already there. What's missing are the proprietary ones like whatsapp, uber and the likes.

It's hardware support and battery life that is severely lacking.

I occasionally contribute, but nothing major. But I have a chuwi x86 tablet running debian with plasma-mobile. It's not perfect but it's quite usable I think. Now if only there would be drivers for the new style non-v4l webcams, it would be better.