I’m not sure how are you isolating the line-art, is it via a colour-override? The easiest way to do this, I think, would be to have a Line-Art node over the colour art, in a way that whatever effect you apply to the colour art would not affect the line art. This assumes you have the line art on the Line-Art sublayer and the colour art on the Colour-Art sublayer. If the line art is a bit lost over the blurred colours you can try adjusting its colour for better contrast, duplicate the line art by connecting a second cable to the composite, etc.
That actually makes sense.
I have both the color and line art separated on each sublayer. So I can try what you are saying.
It seems I may be over complicating things…
I will try your recommendations.