How can I achieve a gradient stroke radial wipe with effects Lottie actually supports?

I’ve been working on a simple dial animation in After Effects which basically entails a knob rotating clockwise. This part of the animation renders seamlessly to Lottie, but there’s a second part: I have a gradient stroke around the knob that wipes in with the movement of the knob. At first, I accomplished this using a radial wipe on the imported Illustrator artwork. I later found out Lottie does not support many effects, including radial wipe. So I tried another method: a stroke ellipse shape layer with trim path. That works, but the gradient does not (I achieved this with two strokes, one tapered, then a series of effects: blur, composite, and levels).

Anyone have any idea how to achieve a gradient along a path that Lottie will accept?