Yes, I thought about making a class but I have absolutely no idea how I can make it. It was a track I wanted to follow but didn’t find information about it. I should check it out later but I am going to be late for the delivery if I go on a new way 
but I still remain interested by a solution
Then study it, you probably already studied unreal source since there is no other way to learn how to make own asset type and editor for it. I kind of briefly look it up and i’m thinking maybe by editing class CDO you can change defaults of that blueprint. look up to what defaults property editor is plugged in to and what it’s editing, and then do the same with our UI.
I post this as anwser since it sounds like valid solution for you needs