Gate blush on light pipe

I have a very small light pipe that I would like to be able to sub-gate, but fear gate blush will be an issue. The part basically has 3 legs, each of which will have an LED. The only place I can see getting a sub-gate on this part is on one of these legs. Otherwise I may need to look at a small tab that would need to be removed as a secondary.

What would it take to eliminate or reduce gate blush. The material is Cyclo Olefin Polymer which I have not used for light pipes before. My experience is with PC only and if this COP acts like PC I think blush would be an issue.