I know I am going out on a limb here but I thought I would ask. Can’t hurt 
Is there any way to design a UI using UMG in the editor but then export that out to Slate code that can be embedded in C++?
I know that sounds obscene, but the reason I am asking is that we are devleoping a lot of custom UIs for Editor Extensions, and it would be a lot easier than writing them all in slate code. Unless there is some way to do it in UMG then somehow embed that in the plugin/edit extension?