Hello Rumble,
Not sure if this helps, but if you enable “Kill on completed” in the “Required” node for your ribbon in cascade it should stop the ribbon from spawning if you “disable” it in your blueprint.
That way the last trail particles will die/fade out.
(be sure the material has a “Particle color” node, and its “Alpha” multiplied with whatever goes into your opacity, that way a color over life’s Alpha control will make sure it fades out)