Thanks. I’ll need to tweak this a bit still, to allow editing the radius dynamically when needed (and probably automatically set Margin values in certain scenarios) but I think I can work from there. I was using UI materials (with Retainer Boxes) to apply gradients to certain widgets, but hadn’t used a material directly as the brush yet.
@Arodi007 In the short term, I might use this too. Since the zero-width outline didn’t fully “obey” the Alpha value, I hadn’t thought the RGB colors would function there either. Thank you also.