Actually, there is app called Launcher 8 WP style in Playstore that looks and acts preety much like W10m. Including navbar and notificaton centre. But, as good as it is it's just acting and by that it's far from original.
Interesting thing is that app has an iap based on yearly subscription. And it's has more than 10 000 000 downloads. If only 5℅ of those took iap, it's pocket full of money for devs.
Also, it means that people like W10m UI and if MS were interested in making good W10m style launcher for Android it would be like hitting Jackpot.