Could you elaborate upon what you mean by "Decker-like"?
Lilt is a command-line interpreter for Lil, and it is like Decker in the sense that it's Decker's scripting language, it's highly portable, and it has a small API of useful bits and pieces that fits comfortably inside your head at once.
Do you instead mean something more visual and drag-and-drop, from the perspective of editing CLI apps, using them, or both?